mirror of
https://github.com/prometheus/prometheus.git
synced 2024-12-26 06:04:05 -08:00
1888 lines
55 KiB
Go
1888 lines
55 KiB
Go
// Copyright 2016 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package scrape
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import (
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"bufio"
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"bytes"
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"compress/gzip"
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"context"
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"errors"
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"fmt"
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"io"
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"math"
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"net/http"
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"reflect"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/go-kit/log"
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"github.com/go-kit/log/level"
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config_util "github.com/prometheus/common/config"
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"github.com/prometheus/common/model"
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"github.com/prometheus/common/version"
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"golang.org/x/exp/slices"
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"github.com/prometheus/prometheus/config"
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"github.com/prometheus/prometheus/discovery/targetgroup"
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"github.com/prometheus/prometheus/model/exemplar"
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"github.com/prometheus/prometheus/model/histogram"
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"github.com/prometheus/prometheus/model/labels"
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"github.com/prometheus/prometheus/model/metadata"
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"github.com/prometheus/prometheus/model/relabel"
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"github.com/prometheus/prometheus/model/textparse"
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"github.com/prometheus/prometheus/model/timestamp"
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"github.com/prometheus/prometheus/model/value"
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"github.com/prometheus/prometheus/storage"
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"github.com/prometheus/prometheus/util/pool"
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)
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// ScrapeTimestampTolerance is the tolerance for scrape appends timestamps
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// alignment, to enable better compression at the TSDB level.
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// See https://github.com/prometheus/prometheus/issues/7846
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var ScrapeTimestampTolerance = 2 * time.Millisecond
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// AlignScrapeTimestamps enables the tolerance for scrape appends timestamps described above.
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var AlignScrapeTimestamps = true
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var errNameLabelMandatory = fmt.Errorf("missing metric name (%s label)", labels.MetricName)
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// scrapePool manages scrapes for sets of targets.
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type scrapePool struct {
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appendable storage.Appendable
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logger log.Logger
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cancel context.CancelFunc
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httpOpts []config_util.HTTPClientOption
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// mtx must not be taken after targetMtx.
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mtx sync.Mutex
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config *config.ScrapeConfig
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client *http.Client
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loops map[uint64]loop
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targetMtx sync.Mutex
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// activeTargets and loops must always be synchronized to have the same
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// set of hashes.
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activeTargets map[uint64]*Target
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droppedTargets []*Target // Subject to KeepDroppedTargets limit.
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droppedTargetsCount int // Count of all dropped targets.
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// Constructor for new scrape loops. This is settable for testing convenience.
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newLoop func(scrapeLoopOptions) loop
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noDefaultPort bool
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metrics *scrapeMetrics
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}
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type labelLimits struct {
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labelLimit int
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labelNameLengthLimit int
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labelValueLengthLimit int
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}
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type scrapeLoopOptions struct {
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target *Target
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scraper scraper
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sampleLimit int
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bucketLimit int
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labelLimits *labelLimits
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honorLabels bool
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honorTimestamps bool
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trackTimestampsStaleness bool
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interval time.Duration
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timeout time.Duration
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scrapeClassicHistograms bool
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mrc []*relabel.Config
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cache *scrapeCache
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enableCompression bool
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}
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const maxAheadTime = 10 * time.Minute
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// returning an empty label set is interpreted as "drop".
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type labelsMutator func(labels.Labels) labels.Labels
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func newScrapePool(cfg *config.ScrapeConfig, app storage.Appendable, offsetSeed uint64, logger log.Logger, buffers *pool.Pool, options *Options, metrics *scrapeMetrics) (*scrapePool, error) {
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if logger == nil {
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logger = log.NewNopLogger()
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}
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client, err := config_util.NewClientFromConfig(cfg.HTTPClientConfig, cfg.JobName, options.HTTPClientOptions...)
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if err != nil {
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return nil, fmt.Errorf("error creating HTTP client: %w", err)
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}
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ctx, cancel := context.WithCancel(context.Background())
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sp := &scrapePool{
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cancel: cancel,
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appendable: app,
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config: cfg,
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client: client,
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activeTargets: map[uint64]*Target{},
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loops: map[uint64]loop{},
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logger: logger,
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metrics: metrics,
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httpOpts: options.HTTPClientOptions,
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noDefaultPort: options.NoDefaultPort,
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}
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sp.newLoop = func(opts scrapeLoopOptions) loop {
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// Update the targets retrieval function for metadata to a new scrape cache.
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cache := opts.cache
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if cache == nil {
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cache = newScrapeCache(metrics)
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}
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opts.target.SetMetadataStore(cache)
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return newScrapeLoop(
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ctx,
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opts.scraper,
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log.With(logger, "target", opts.target),
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buffers,
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func(l labels.Labels) labels.Labels {
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return mutateSampleLabels(l, opts.target, opts.honorLabels, opts.mrc)
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},
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func(l labels.Labels) labels.Labels { return mutateReportSampleLabels(l, opts.target) },
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func(ctx context.Context) storage.Appender { return app.Appender(ctx) },
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cache,
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offsetSeed,
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opts.honorTimestamps,
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opts.trackTimestampsStaleness,
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opts.enableCompression,
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opts.sampleLimit,
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opts.bucketLimit,
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opts.labelLimits,
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opts.interval,
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opts.timeout,
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opts.scrapeClassicHistograms,
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options.ExtraMetrics,
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options.EnableMetadataStorage,
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opts.target,
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options.PassMetadataInContext,
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metrics,
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)
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}
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sp.metrics.targetScrapePoolTargetLimit.WithLabelValues(sp.config.JobName).Set(float64(sp.config.TargetLimit))
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return sp, nil
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}
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func (sp *scrapePool) ActiveTargets() []*Target {
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sp.targetMtx.Lock()
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defer sp.targetMtx.Unlock()
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var tActive []*Target
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for _, t := range sp.activeTargets {
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tActive = append(tActive, t)
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}
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return tActive
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}
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// Return dropped targets, subject to KeepDroppedTargets limit.
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func (sp *scrapePool) DroppedTargets() []*Target {
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sp.targetMtx.Lock()
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defer sp.targetMtx.Unlock()
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return sp.droppedTargets
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}
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func (sp *scrapePool) DroppedTargetsCount() int {
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sp.targetMtx.Lock()
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defer sp.targetMtx.Unlock()
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return sp.droppedTargetsCount
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}
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// stop terminates all scrape loops and returns after they all terminated.
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func (sp *scrapePool) stop() {
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sp.mtx.Lock()
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defer sp.mtx.Unlock()
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sp.cancel()
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var wg sync.WaitGroup
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sp.targetMtx.Lock()
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for fp, l := range sp.loops {
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wg.Add(1)
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go func(l loop) {
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l.stop()
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wg.Done()
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}(l)
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delete(sp.loops, fp)
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delete(sp.activeTargets, fp)
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}
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sp.targetMtx.Unlock()
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wg.Wait()
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sp.client.CloseIdleConnections()
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if sp.config != nil {
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sp.metrics.targetScrapePoolSyncsCounter.DeleteLabelValues(sp.config.JobName)
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sp.metrics.targetScrapePoolTargetLimit.DeleteLabelValues(sp.config.JobName)
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sp.metrics.targetScrapePoolTargetsAdded.DeleteLabelValues(sp.config.JobName)
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sp.metrics.targetSyncIntervalLength.DeleteLabelValues(sp.config.JobName)
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sp.metrics.targetSyncFailed.DeleteLabelValues(sp.config.JobName)
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}
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}
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// reload the scrape pool with the given scrape configuration. The target state is preserved
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// but all scrape loops are restarted with the new scrape configuration.
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// This method returns after all scrape loops that were stopped have stopped scraping.
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func (sp *scrapePool) reload(cfg *config.ScrapeConfig) error {
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sp.mtx.Lock()
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defer sp.mtx.Unlock()
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sp.metrics.targetScrapePoolReloads.Inc()
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start := time.Now()
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client, err := config_util.NewClientFromConfig(cfg.HTTPClientConfig, cfg.JobName, sp.httpOpts...)
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if err != nil {
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sp.metrics.targetScrapePoolReloadsFailed.Inc()
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return fmt.Errorf("error creating HTTP client: %w", err)
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}
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reuseCache := reusableCache(sp.config, cfg)
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sp.config = cfg
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oldClient := sp.client
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sp.client = client
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sp.metrics.targetScrapePoolTargetLimit.WithLabelValues(sp.config.JobName).Set(float64(sp.config.TargetLimit))
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var (
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wg sync.WaitGroup
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interval = time.Duration(sp.config.ScrapeInterval)
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timeout = time.Duration(sp.config.ScrapeTimeout)
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bodySizeLimit = int64(sp.config.BodySizeLimit)
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sampleLimit = int(sp.config.SampleLimit)
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bucketLimit = int(sp.config.NativeHistogramBucketLimit)
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labelLimits = &labelLimits{
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labelLimit: int(sp.config.LabelLimit),
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labelNameLengthLimit: int(sp.config.LabelNameLengthLimit),
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labelValueLengthLimit: int(sp.config.LabelValueLengthLimit),
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}
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honorLabels = sp.config.HonorLabels
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honorTimestamps = sp.config.HonorTimestamps
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enableCompression = sp.config.EnableCompression
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trackTimestampsStaleness = sp.config.TrackTimestampsStaleness
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mrc = sp.config.MetricRelabelConfigs
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)
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sp.targetMtx.Lock()
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forcedErr := sp.refreshTargetLimitErr()
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for fp, oldLoop := range sp.loops {
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var cache *scrapeCache
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if oc := oldLoop.getCache(); reuseCache && oc != nil {
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oldLoop.disableEndOfRunStalenessMarkers()
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cache = oc
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} else {
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cache = newScrapeCache(sp.metrics)
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}
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t := sp.activeTargets[fp]
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interval, timeout, err := t.intervalAndTimeout(interval, timeout)
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var (
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s = &targetScraper{
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Target: t,
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client: sp.client,
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timeout: timeout,
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bodySizeLimit: bodySizeLimit,
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acceptHeader: acceptHeader(cfg.ScrapeProtocols),
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acceptEncodingHeader: acceptEncodingHeader(enableCompression),
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}
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newLoop = sp.newLoop(scrapeLoopOptions{
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target: t,
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scraper: s,
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sampleLimit: sampleLimit,
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bucketLimit: bucketLimit,
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labelLimits: labelLimits,
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honorLabels: honorLabels,
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honorTimestamps: honorTimestamps,
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enableCompression: enableCompression,
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trackTimestampsStaleness: trackTimestampsStaleness,
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mrc: mrc,
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cache: cache,
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interval: interval,
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timeout: timeout,
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})
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)
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if err != nil {
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newLoop.setForcedError(err)
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}
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wg.Add(1)
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go func(oldLoop, newLoop loop) {
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oldLoop.stop()
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wg.Done()
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newLoop.setForcedError(forcedErr)
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newLoop.run(nil)
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}(oldLoop, newLoop)
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sp.loops[fp] = newLoop
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}
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sp.targetMtx.Unlock()
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wg.Wait()
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oldClient.CloseIdleConnections()
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sp.metrics.targetReloadIntervalLength.WithLabelValues(interval.String()).Observe(
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time.Since(start).Seconds(),
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)
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return nil
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}
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// Sync converts target groups into actual scrape targets and synchronizes
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// the currently running scraper with the resulting set and returns all scraped and dropped targets.
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func (sp *scrapePool) Sync(tgs []*targetgroup.Group) {
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sp.mtx.Lock()
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defer sp.mtx.Unlock()
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start := time.Now()
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sp.targetMtx.Lock()
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var all []*Target
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var targets []*Target
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lb := labels.NewBuilder(labels.EmptyLabels())
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sp.droppedTargets = []*Target{}
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sp.droppedTargetsCount = 0
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for _, tg := range tgs {
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targets, failures := TargetsFromGroup(tg, sp.config, sp.noDefaultPort, targets, lb)
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for _, err := range failures {
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level.Error(sp.logger).Log("msg", "Creating target failed", "err", err)
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}
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sp.metrics.targetSyncFailed.WithLabelValues(sp.config.JobName).Add(float64(len(failures)))
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for _, t := range targets {
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// Replicate .Labels().IsEmpty() with a loop here to avoid generating garbage.
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nonEmpty := false
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t.LabelsRange(func(l labels.Label) { nonEmpty = true })
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switch {
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case nonEmpty:
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all = append(all, t)
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case !t.discoveredLabels.IsEmpty():
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if sp.config.KeepDroppedTargets == 0 || uint(len(sp.droppedTargets)) < sp.config.KeepDroppedTargets {
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sp.droppedTargets = append(sp.droppedTargets, t)
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}
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sp.droppedTargetsCount++
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}
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}
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}
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sp.targetMtx.Unlock()
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sp.sync(all)
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sp.metrics.targetSyncIntervalLength.WithLabelValues(sp.config.JobName).Observe(
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time.Since(start).Seconds(),
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)
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sp.metrics.targetScrapePoolSyncsCounter.WithLabelValues(sp.config.JobName).Inc()
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}
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// sync takes a list of potentially duplicated targets, deduplicates them, starts
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// scrape loops for new targets, and stops scrape loops for disappeared targets.
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// It returns after all stopped scrape loops terminated.
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func (sp *scrapePool) sync(targets []*Target) {
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var (
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uniqueLoops = make(map[uint64]loop)
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interval = time.Duration(sp.config.ScrapeInterval)
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timeout = time.Duration(sp.config.ScrapeTimeout)
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bodySizeLimit = int64(sp.config.BodySizeLimit)
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sampleLimit = int(sp.config.SampleLimit)
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bucketLimit = int(sp.config.NativeHistogramBucketLimit)
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labelLimits = &labelLimits{
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labelLimit: int(sp.config.LabelLimit),
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labelNameLengthLimit: int(sp.config.LabelNameLengthLimit),
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labelValueLengthLimit: int(sp.config.LabelValueLengthLimit),
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}
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honorLabels = sp.config.HonorLabels
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honorTimestamps = sp.config.HonorTimestamps
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enableCompression = sp.config.EnableCompression
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trackTimestampsStaleness = sp.config.TrackTimestampsStaleness
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mrc = sp.config.MetricRelabelConfigs
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scrapeClassicHistograms = sp.config.ScrapeClassicHistograms
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)
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sp.targetMtx.Lock()
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for _, t := range targets {
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hash := t.hash()
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if _, ok := sp.activeTargets[hash]; !ok {
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// The scrape interval and timeout labels are set to the config's values initially,
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// so whether changed via relabeling or not, they'll exist and hold the correct values
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// for every target.
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var err error
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interval, timeout, err = t.intervalAndTimeout(interval, timeout)
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s := &targetScraper{
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Target: t,
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client: sp.client,
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timeout: timeout,
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bodySizeLimit: bodySizeLimit,
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acceptHeader: acceptHeader(sp.config.ScrapeProtocols),
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acceptEncodingHeader: acceptEncodingHeader(enableCompression),
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metrics: sp.metrics,
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}
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l := sp.newLoop(scrapeLoopOptions{
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target: t,
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scraper: s,
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sampleLimit: sampleLimit,
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bucketLimit: bucketLimit,
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labelLimits: labelLimits,
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honorLabels: honorLabels,
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honorTimestamps: honorTimestamps,
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enableCompression: enableCompression,
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trackTimestampsStaleness: trackTimestampsStaleness,
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mrc: mrc,
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interval: interval,
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timeout: timeout,
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scrapeClassicHistograms: scrapeClassicHistograms,
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})
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if err != nil {
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l.setForcedError(err)
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}
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sp.activeTargets[hash] = t
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sp.loops[hash] = l
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uniqueLoops[hash] = l
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} else {
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// This might be a duplicated target.
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if _, ok := uniqueLoops[hash]; !ok {
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uniqueLoops[hash] = nil
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}
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// Need to keep the most updated labels information
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// for displaying it in the Service Discovery web page.
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sp.activeTargets[hash].SetDiscoveredLabels(t.DiscoveredLabels())
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}
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}
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var wg sync.WaitGroup
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|
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// Stop and remove old targets and scraper loops.
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for hash := range sp.activeTargets {
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if _, ok := uniqueLoops[hash]; !ok {
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wg.Add(1)
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go func(l loop) {
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l.stop()
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wg.Done()
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}(sp.loops[hash])
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delete(sp.loops, hash)
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delete(sp.activeTargets, hash)
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}
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}
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sp.targetMtx.Unlock()
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sp.metrics.targetScrapePoolTargetsAdded.WithLabelValues(sp.config.JobName).Set(float64(len(uniqueLoops)))
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forcedErr := sp.refreshTargetLimitErr()
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for _, l := range sp.loops {
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l.setForcedError(forcedErr)
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}
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for _, l := range uniqueLoops {
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if l != nil {
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go l.run(nil)
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}
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}
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// Wait for all potentially stopped scrapers to terminate.
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// This covers the case of flapping targets. If the server is under high load, a new scraper
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// may be active and tries to insert. The old scraper that didn't terminate yet could still
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// be inserting a previous sample set.
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wg.Wait()
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}
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|
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// refreshTargetLimitErr returns an error that can be passed to the scrape loops
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// if the number of targets exceeds the configured limit.
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func (sp *scrapePool) refreshTargetLimitErr() error {
|
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if sp.config == nil || sp.config.TargetLimit == 0 {
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return nil
|
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}
|
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if l := len(sp.activeTargets); l > int(sp.config.TargetLimit) {
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sp.metrics.targetScrapePoolExceededTargetLimit.Inc()
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return fmt.Errorf("target_limit exceeded (number of targets: %d, limit: %d)", l, sp.config.TargetLimit)
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}
|
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return nil
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}
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|
|
func verifyLabelLimits(lset labels.Labels, limits *labelLimits) error {
|
|
if limits == nil {
|
|
return nil
|
|
}
|
|
|
|
met := lset.Get(labels.MetricName)
|
|
if limits.labelLimit > 0 {
|
|
nbLabels := lset.Len()
|
|
if nbLabels > limits.labelLimit {
|
|
return fmt.Errorf("label_limit exceeded (metric: %.50s, number of labels: %d, limit: %d)", met, nbLabels, limits.labelLimit)
|
|
}
|
|
}
|
|
|
|
if limits.labelNameLengthLimit == 0 && limits.labelValueLengthLimit == 0 {
|
|
return nil
|
|
}
|
|
|
|
return lset.Validate(func(l labels.Label) error {
|
|
if limits.labelNameLengthLimit > 0 {
|
|
nameLength := len(l.Name)
|
|
if nameLength > limits.labelNameLengthLimit {
|
|
return fmt.Errorf("label_name_length_limit exceeded (metric: %.50s, label name: %.50s, length: %d, limit: %d)", met, l.Name, nameLength, limits.labelNameLengthLimit)
|
|
}
|
|
}
|
|
|
|
if limits.labelValueLengthLimit > 0 {
|
|
valueLength := len(l.Value)
|
|
if valueLength > limits.labelValueLengthLimit {
|
|
return fmt.Errorf("label_value_length_limit exceeded (metric: %.50s, label name: %.50s, value: %.50q, length: %d, limit: %d)", met, l.Name, l.Value, valueLength, limits.labelValueLengthLimit)
|
|
}
|
|
}
|
|
return nil
|
|
})
|
|
}
|
|
|
|
func mutateSampleLabels(lset labels.Labels, target *Target, honor bool, rc []*relabel.Config) labels.Labels {
|
|
lb := labels.NewBuilder(lset)
|
|
|
|
if honor {
|
|
target.LabelsRange(func(l labels.Label) {
|
|
if !lset.Has(l.Name) {
|
|
lb.Set(l.Name, l.Value)
|
|
}
|
|
})
|
|
} else {
|
|
var conflictingExposedLabels []labels.Label
|
|
target.LabelsRange(func(l labels.Label) {
|
|
existingValue := lset.Get(l.Name)
|
|
if existingValue != "" {
|
|
conflictingExposedLabels = append(conflictingExposedLabels, labels.Label{Name: l.Name, Value: existingValue})
|
|
}
|
|
// It is now safe to set the target label.
|
|
lb.Set(l.Name, l.Value)
|
|
})
|
|
|
|
if len(conflictingExposedLabels) > 0 {
|
|
resolveConflictingExposedLabels(lb, conflictingExposedLabels)
|
|
}
|
|
}
|
|
|
|
res := lb.Labels()
|
|
|
|
if len(rc) > 0 {
|
|
res, _ = relabel.Process(res, rc...)
|
|
}
|
|
|
|
return res
|
|
}
|
|
|
|
func resolveConflictingExposedLabels(lb *labels.Builder, conflictingExposedLabels []labels.Label) {
|
|
slices.SortStableFunc(conflictingExposedLabels, func(a, b labels.Label) int {
|
|
return len(a.Name) - len(b.Name)
|
|
})
|
|
|
|
for _, l := range conflictingExposedLabels {
|
|
newName := l.Name
|
|
for {
|
|
newName = model.ExportedLabelPrefix + newName
|
|
if lb.Get(newName) == "" {
|
|
lb.Set(newName, l.Value)
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func mutateReportSampleLabels(lset labels.Labels, target *Target) labels.Labels {
|
|
lb := labels.NewBuilder(lset)
|
|
|
|
target.LabelsRange(func(l labels.Label) {
|
|
lb.Set(model.ExportedLabelPrefix+l.Name, lset.Get(l.Name))
|
|
lb.Set(l.Name, l.Value)
|
|
})
|
|
|
|
return lb.Labels()
|
|
}
|
|
|
|
// appender returns an appender for ingested samples from the target.
|
|
func appender(app storage.Appender, sampleLimit, bucketLimit int) storage.Appender {
|
|
app = &timeLimitAppender{
|
|
Appender: app,
|
|
maxTime: timestamp.FromTime(time.Now().Add(maxAheadTime)),
|
|
}
|
|
|
|
// The sampleLimit is applied after metrics are potentially dropped via relabeling.
|
|
if sampleLimit > 0 {
|
|
app = &limitAppender{
|
|
Appender: app,
|
|
limit: sampleLimit,
|
|
}
|
|
}
|
|
|
|
if bucketLimit > 0 {
|
|
app = &bucketLimitAppender{
|
|
Appender: app,
|
|
limit: bucketLimit,
|
|
}
|
|
}
|
|
return app
|
|
}
|
|
|
|
// A scraper retrieves samples and accepts a status report at the end.
|
|
type scraper interface {
|
|
scrape(ctx context.Context) (*http.Response, error)
|
|
readResponse(ctx context.Context, resp *http.Response, w io.Writer) (string, error)
|
|
Report(start time.Time, dur time.Duration, err error)
|
|
offset(interval time.Duration, offsetSeed uint64) time.Duration
|
|
}
|
|
|
|
// targetScraper implements the scraper interface for a target.
|
|
type targetScraper struct {
|
|
*Target
|
|
|
|
client *http.Client
|
|
req *http.Request
|
|
timeout time.Duration
|
|
|
|
gzipr *gzip.Reader
|
|
buf *bufio.Reader
|
|
|
|
bodySizeLimit int64
|
|
acceptHeader string
|
|
acceptEncodingHeader string
|
|
|
|
metrics *scrapeMetrics
|
|
}
|
|
|
|
var errBodySizeLimit = errors.New("body size limit exceeded")
|
|
|
|
// acceptHeader transforms preference from the options into specific header values as
|
|
// https://www.rfc-editor.org/rfc/rfc9110.html#name-accept defines.
|
|
// No validation is here, we expect scrape protocols to be validated already.
|
|
func acceptHeader(sps []config.ScrapeProtocol) string {
|
|
var vals []string
|
|
weight := len(config.ScrapeProtocolsHeaders) + 1
|
|
for _, sp := range sps {
|
|
vals = append(vals, fmt.Sprintf("%s;q=0.%d", config.ScrapeProtocolsHeaders[sp], weight))
|
|
weight--
|
|
}
|
|
// Default match anything.
|
|
vals = append(vals, fmt.Sprintf("*/*;q=%d", weight))
|
|
return strings.Join(vals, ",")
|
|
}
|
|
|
|
func acceptEncodingHeader(enableCompression bool) string {
|
|
if enableCompression {
|
|
return "gzip"
|
|
}
|
|
return "identity"
|
|
}
|
|
|
|
var UserAgent = fmt.Sprintf("Prometheus/%s", version.Version)
|
|
|
|
func (s *targetScraper) scrape(ctx context.Context) (*http.Response, error) {
|
|
if s.req == nil {
|
|
req, err := http.NewRequest("GET", s.URL().String(), nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
req.Header.Add("Accept", s.acceptHeader)
|
|
req.Header.Add("Accept-Encoding", s.acceptEncodingHeader)
|
|
req.Header.Set("User-Agent", UserAgent)
|
|
req.Header.Set("X-Prometheus-Scrape-Timeout-Seconds", strconv.FormatFloat(s.timeout.Seconds(), 'f', -1, 64))
|
|
|
|
s.req = req
|
|
}
|
|
|
|
return s.client.Do(s.req.WithContext(ctx))
|
|
}
|
|
|
|
func (s *targetScraper) readResponse(ctx context.Context, resp *http.Response, w io.Writer) (string, error) {
|
|
defer func() {
|
|
io.Copy(io.Discard, resp.Body)
|
|
resp.Body.Close()
|
|
}()
|
|
|
|
if resp.StatusCode != http.StatusOK {
|
|
return "", fmt.Errorf("server returned HTTP status %s", resp.Status)
|
|
}
|
|
|
|
if s.bodySizeLimit <= 0 {
|
|
s.bodySizeLimit = math.MaxInt64
|
|
}
|
|
if resp.Header.Get("Content-Encoding") != "gzip" {
|
|
n, err := io.Copy(w, io.LimitReader(resp.Body, s.bodySizeLimit))
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
if n >= s.bodySizeLimit {
|
|
s.metrics.targetScrapeExceededBodySizeLimit.Inc()
|
|
return "", errBodySizeLimit
|
|
}
|
|
return resp.Header.Get("Content-Type"), nil
|
|
}
|
|
|
|
if s.gzipr == nil {
|
|
s.buf = bufio.NewReader(resp.Body)
|
|
var err error
|
|
s.gzipr, err = gzip.NewReader(s.buf)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
} else {
|
|
s.buf.Reset(resp.Body)
|
|
if err := s.gzipr.Reset(s.buf); err != nil {
|
|
return "", err
|
|
}
|
|
}
|
|
|
|
n, err := io.Copy(w, io.LimitReader(s.gzipr, s.bodySizeLimit))
|
|
s.gzipr.Close()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
if n >= s.bodySizeLimit {
|
|
s.metrics.targetScrapeExceededBodySizeLimit.Inc()
|
|
return "", errBodySizeLimit
|
|
}
|
|
return resp.Header.Get("Content-Type"), nil
|
|
}
|
|
|
|
// A loop can run and be stopped again. It must not be reused after it was stopped.
|
|
type loop interface {
|
|
run(errc chan<- error)
|
|
setForcedError(err error)
|
|
stop()
|
|
getCache() *scrapeCache
|
|
disableEndOfRunStalenessMarkers()
|
|
}
|
|
|
|
type cacheEntry struct {
|
|
ref storage.SeriesRef
|
|
lastIter uint64
|
|
hash uint64
|
|
lset labels.Labels
|
|
}
|
|
|
|
type scrapeLoop struct {
|
|
scraper scraper
|
|
l log.Logger
|
|
cache *scrapeCache
|
|
lastScrapeSize int
|
|
buffers *pool.Pool
|
|
offsetSeed uint64
|
|
honorTimestamps bool
|
|
trackTimestampsStaleness bool
|
|
enableCompression bool
|
|
forcedErr error
|
|
forcedErrMtx sync.Mutex
|
|
sampleLimit int
|
|
bucketLimit int
|
|
labelLimits *labelLimits
|
|
interval time.Duration
|
|
timeout time.Duration
|
|
scrapeClassicHistograms bool
|
|
|
|
appender func(ctx context.Context) storage.Appender
|
|
sampleMutator labelsMutator
|
|
reportSampleMutator labelsMutator
|
|
|
|
parentCtx context.Context
|
|
appenderCtx context.Context
|
|
ctx context.Context
|
|
cancel func()
|
|
stopped chan struct{}
|
|
|
|
disabledEndOfRunStalenessMarkers bool
|
|
|
|
reportExtraMetrics bool
|
|
appendMetadataToWAL bool
|
|
|
|
metrics *scrapeMetrics
|
|
}
|
|
|
|
// scrapeCache tracks mappings of exposed metric strings to label sets and
|
|
// storage references. Additionally, it tracks staleness of series between
|
|
// scrapes.
|
|
type scrapeCache struct {
|
|
iter uint64 // Current scrape iteration.
|
|
|
|
// How many series and metadata entries there were at the last success.
|
|
successfulCount int
|
|
|
|
// Parsed string to an entry with information about the actual label set
|
|
// and its storage reference.
|
|
series map[string]*cacheEntry
|
|
|
|
// Cache of dropped metric strings and their iteration. The iteration must
|
|
// be a pointer so we can update it.
|
|
droppedSeries map[string]*uint64
|
|
|
|
// seriesCur and seriesPrev store the labels of series that were seen
|
|
// in the current and previous scrape.
|
|
// We hold two maps and swap them out to save allocations.
|
|
seriesCur map[uint64]labels.Labels
|
|
seriesPrev map[uint64]labels.Labels
|
|
|
|
metaMtx sync.Mutex
|
|
metadata map[string]*metaEntry
|
|
|
|
metrics *scrapeMetrics
|
|
}
|
|
|
|
// metaEntry holds meta information about a metric.
|
|
type metaEntry struct {
|
|
metadata.Metadata
|
|
|
|
lastIter uint64 // Last scrape iteration the entry was observed at.
|
|
lastIterChange uint64 // Last scrape iteration the entry was changed at.
|
|
}
|
|
|
|
func (m *metaEntry) size() int {
|
|
// The attribute lastIter although part of the struct it is not metadata.
|
|
return len(m.Help) + len(m.Unit) + len(m.Type)
|
|
}
|
|
|
|
func newScrapeCache(metrics *scrapeMetrics) *scrapeCache {
|
|
return &scrapeCache{
|
|
series: map[string]*cacheEntry{},
|
|
droppedSeries: map[string]*uint64{},
|
|
seriesCur: map[uint64]labels.Labels{},
|
|
seriesPrev: map[uint64]labels.Labels{},
|
|
metadata: map[string]*metaEntry{},
|
|
metrics: metrics,
|
|
}
|
|
}
|
|
|
|
func (c *scrapeCache) iterDone(flushCache bool) {
|
|
c.metaMtx.Lock()
|
|
count := len(c.series) + len(c.droppedSeries) + len(c.metadata)
|
|
c.metaMtx.Unlock()
|
|
|
|
switch {
|
|
case flushCache:
|
|
c.successfulCount = count
|
|
case count > c.successfulCount*2+1000:
|
|
// If a target had varying labels in scrapes that ultimately failed,
|
|
// the caches would grow indefinitely. Force a flush when this happens.
|
|
// We use the heuristic that this is a doubling of the cache size
|
|
// since the last scrape, and allow an additional 1000 in case
|
|
// initial scrapes all fail.
|
|
flushCache = true
|
|
c.metrics.targetScrapeCacheFlushForced.Inc()
|
|
}
|
|
|
|
if flushCache {
|
|
// All caches may grow over time through series churn
|
|
// or multiple string representations of the same metric. Clean up entries
|
|
// that haven't appeared in the last scrape.
|
|
for s, e := range c.series {
|
|
if c.iter != e.lastIter {
|
|
delete(c.series, s)
|
|
}
|
|
}
|
|
for s, iter := range c.droppedSeries {
|
|
if c.iter != *iter {
|
|
delete(c.droppedSeries, s)
|
|
}
|
|
}
|
|
c.metaMtx.Lock()
|
|
for m, e := range c.metadata {
|
|
// Keep metadata around for 10 scrapes after its metric disappeared.
|
|
if c.iter-e.lastIter > 10 {
|
|
delete(c.metadata, m)
|
|
}
|
|
}
|
|
c.metaMtx.Unlock()
|
|
|
|
c.iter++
|
|
}
|
|
|
|
// Swap current and previous series.
|
|
c.seriesPrev, c.seriesCur = c.seriesCur, c.seriesPrev
|
|
|
|
// We have to delete every single key in the map.
|
|
for k := range c.seriesCur {
|
|
delete(c.seriesCur, k)
|
|
}
|
|
}
|
|
|
|
func (c *scrapeCache) get(met []byte) (*cacheEntry, bool) {
|
|
e, ok := c.series[string(met)]
|
|
if !ok {
|
|
return nil, false
|
|
}
|
|
e.lastIter = c.iter
|
|
return e, true
|
|
}
|
|
|
|
func (c *scrapeCache) addRef(met []byte, ref storage.SeriesRef, lset labels.Labels, hash uint64) {
|
|
if ref == 0 {
|
|
return
|
|
}
|
|
c.series[string(met)] = &cacheEntry{ref: ref, lastIter: c.iter, lset: lset, hash: hash}
|
|
}
|
|
|
|
func (c *scrapeCache) addDropped(met []byte) {
|
|
iter := c.iter
|
|
c.droppedSeries[string(met)] = &iter
|
|
}
|
|
|
|
func (c *scrapeCache) getDropped(met []byte) bool {
|
|
iterp, ok := c.droppedSeries[string(met)]
|
|
if ok {
|
|
*iterp = c.iter
|
|
}
|
|
return ok
|
|
}
|
|
|
|
func (c *scrapeCache) trackStaleness(hash uint64, lset labels.Labels) {
|
|
c.seriesCur[hash] = lset
|
|
}
|
|
|
|
func (c *scrapeCache) forEachStale(f func(labels.Labels) bool) {
|
|
for h, lset := range c.seriesPrev {
|
|
if _, ok := c.seriesCur[h]; !ok {
|
|
if !f(lset) {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (c *scrapeCache) setType(metric []byte, t textparse.MetricType) {
|
|
c.metaMtx.Lock()
|
|
|
|
e, ok := c.metadata[string(metric)]
|
|
if !ok {
|
|
e = &metaEntry{Metadata: metadata.Metadata{Type: textparse.MetricTypeUnknown}}
|
|
c.metadata[string(metric)] = e
|
|
}
|
|
if e.Type != t {
|
|
e.Type = t
|
|
e.lastIterChange = c.iter
|
|
}
|
|
e.lastIter = c.iter
|
|
|
|
c.metaMtx.Unlock()
|
|
}
|
|
|
|
func (c *scrapeCache) setHelp(metric, help []byte) {
|
|
c.metaMtx.Lock()
|
|
|
|
e, ok := c.metadata[string(metric)]
|
|
if !ok {
|
|
e = &metaEntry{Metadata: metadata.Metadata{Type: textparse.MetricTypeUnknown}}
|
|
c.metadata[string(metric)] = e
|
|
}
|
|
if e.Help != string(help) {
|
|
e.Help = string(help)
|
|
e.lastIterChange = c.iter
|
|
}
|
|
e.lastIter = c.iter
|
|
|
|
c.metaMtx.Unlock()
|
|
}
|
|
|
|
func (c *scrapeCache) setUnit(metric, unit []byte) {
|
|
c.metaMtx.Lock()
|
|
|
|
e, ok := c.metadata[string(metric)]
|
|
if !ok {
|
|
e = &metaEntry{Metadata: metadata.Metadata{Type: textparse.MetricTypeUnknown}}
|
|
c.metadata[string(metric)] = e
|
|
}
|
|
if e.Unit != string(unit) {
|
|
e.Unit = string(unit)
|
|
e.lastIterChange = c.iter
|
|
}
|
|
e.lastIter = c.iter
|
|
|
|
c.metaMtx.Unlock()
|
|
}
|
|
|
|
func (c *scrapeCache) GetMetadata(metric string) (MetricMetadata, bool) {
|
|
c.metaMtx.Lock()
|
|
defer c.metaMtx.Unlock()
|
|
|
|
m, ok := c.metadata[metric]
|
|
if !ok {
|
|
return MetricMetadata{}, false
|
|
}
|
|
return MetricMetadata{
|
|
Metric: metric,
|
|
Type: m.Type,
|
|
Help: m.Help,
|
|
Unit: m.Unit,
|
|
}, true
|
|
}
|
|
|
|
func (c *scrapeCache) ListMetadata() []MetricMetadata {
|
|
c.metaMtx.Lock()
|
|
defer c.metaMtx.Unlock()
|
|
|
|
res := make([]MetricMetadata, 0, len(c.metadata))
|
|
|
|
for m, e := range c.metadata {
|
|
res = append(res, MetricMetadata{
|
|
Metric: m,
|
|
Type: e.Type,
|
|
Help: e.Help,
|
|
Unit: e.Unit,
|
|
})
|
|
}
|
|
return res
|
|
}
|
|
|
|
// MetadataSize returns the size of the metadata cache.
|
|
func (c *scrapeCache) SizeMetadata() (s int) {
|
|
c.metaMtx.Lock()
|
|
defer c.metaMtx.Unlock()
|
|
for _, e := range c.metadata {
|
|
s += e.size()
|
|
}
|
|
|
|
return s
|
|
}
|
|
|
|
// MetadataLen returns the number of metadata entries in the cache.
|
|
func (c *scrapeCache) LengthMetadata() int {
|
|
c.metaMtx.Lock()
|
|
defer c.metaMtx.Unlock()
|
|
|
|
return len(c.metadata)
|
|
}
|
|
|
|
func newScrapeLoop(ctx context.Context,
|
|
sc scraper,
|
|
l log.Logger,
|
|
buffers *pool.Pool,
|
|
sampleMutator labelsMutator,
|
|
reportSampleMutator labelsMutator,
|
|
appender func(ctx context.Context) storage.Appender,
|
|
cache *scrapeCache,
|
|
offsetSeed uint64,
|
|
honorTimestamps bool,
|
|
trackTimestampsStaleness bool,
|
|
enableCompression bool,
|
|
sampleLimit int,
|
|
bucketLimit int,
|
|
labelLimits *labelLimits,
|
|
interval time.Duration,
|
|
timeout time.Duration,
|
|
scrapeClassicHistograms bool,
|
|
reportExtraMetrics bool,
|
|
appendMetadataToWAL bool,
|
|
target *Target,
|
|
passMetadataInContext bool,
|
|
metrics *scrapeMetrics,
|
|
) *scrapeLoop {
|
|
if l == nil {
|
|
l = log.NewNopLogger()
|
|
}
|
|
if buffers == nil {
|
|
buffers = pool.New(1e3, 1e6, 3, func(sz int) interface{} { return make([]byte, 0, sz) })
|
|
}
|
|
if cache == nil {
|
|
cache = newScrapeCache(metrics)
|
|
}
|
|
|
|
appenderCtx := ctx
|
|
|
|
if passMetadataInContext {
|
|
// Store the cache and target in the context. This is then used by downstream OTel Collector
|
|
// to lookup the metadata required to process the samples. Not used by Prometheus itself.
|
|
// TODO(gouthamve) We're using a dedicated context because using the parentCtx caused a memory
|
|
// leak. We should ideally fix the main leak. See: https://github.com/prometheus/prometheus/pull/10590
|
|
appenderCtx = ContextWithMetricMetadataStore(appenderCtx, cache)
|
|
appenderCtx = ContextWithTarget(appenderCtx, target)
|
|
}
|
|
|
|
sl := &scrapeLoop{
|
|
scraper: sc,
|
|
buffers: buffers,
|
|
cache: cache,
|
|
appender: appender,
|
|
sampleMutator: sampleMutator,
|
|
reportSampleMutator: reportSampleMutator,
|
|
stopped: make(chan struct{}),
|
|
offsetSeed: offsetSeed,
|
|
l: l,
|
|
parentCtx: ctx,
|
|
appenderCtx: appenderCtx,
|
|
honorTimestamps: honorTimestamps,
|
|
trackTimestampsStaleness: trackTimestampsStaleness,
|
|
enableCompression: enableCompression,
|
|
sampleLimit: sampleLimit,
|
|
bucketLimit: bucketLimit,
|
|
labelLimits: labelLimits,
|
|
interval: interval,
|
|
timeout: timeout,
|
|
scrapeClassicHistograms: scrapeClassicHistograms,
|
|
reportExtraMetrics: reportExtraMetrics,
|
|
appendMetadataToWAL: appendMetadataToWAL,
|
|
metrics: metrics,
|
|
}
|
|
sl.ctx, sl.cancel = context.WithCancel(ctx)
|
|
|
|
return sl
|
|
}
|
|
|
|
func (sl *scrapeLoop) run(errc chan<- error) {
|
|
select {
|
|
case <-time.After(sl.scraper.offset(sl.interval, sl.offsetSeed)):
|
|
// Continue after a scraping offset.
|
|
case <-sl.ctx.Done():
|
|
close(sl.stopped)
|
|
return
|
|
}
|
|
|
|
var last time.Time
|
|
|
|
alignedScrapeTime := time.Now().Round(0)
|
|
ticker := time.NewTicker(sl.interval)
|
|
defer ticker.Stop()
|
|
|
|
mainLoop:
|
|
for {
|
|
select {
|
|
case <-sl.parentCtx.Done():
|
|
close(sl.stopped)
|
|
return
|
|
case <-sl.ctx.Done():
|
|
break mainLoop
|
|
default:
|
|
}
|
|
|
|
// Temporary workaround for a jitter in go timers that causes disk space
|
|
// increase in TSDB.
|
|
// See https://github.com/prometheus/prometheus/issues/7846
|
|
// Calling Round ensures the time used is the wall clock, as otherwise .Sub
|
|
// and .Add on time.Time behave differently (see time package docs).
|
|
scrapeTime := time.Now().Round(0)
|
|
if AlignScrapeTimestamps && sl.interval > 100*ScrapeTimestampTolerance {
|
|
// For some reason, a tick might have been skipped, in which case we
|
|
// would call alignedScrapeTime.Add(interval) multiple times.
|
|
for scrapeTime.Sub(alignedScrapeTime) >= sl.interval {
|
|
alignedScrapeTime = alignedScrapeTime.Add(sl.interval)
|
|
}
|
|
// Align the scrape time if we are in the tolerance boundaries.
|
|
if scrapeTime.Sub(alignedScrapeTime) <= ScrapeTimestampTolerance {
|
|
scrapeTime = alignedScrapeTime
|
|
}
|
|
}
|
|
|
|
last = sl.scrapeAndReport(last, scrapeTime, errc)
|
|
|
|
select {
|
|
case <-sl.parentCtx.Done():
|
|
close(sl.stopped)
|
|
return
|
|
case <-sl.ctx.Done():
|
|
break mainLoop
|
|
case <-ticker.C:
|
|
}
|
|
}
|
|
|
|
close(sl.stopped)
|
|
|
|
if !sl.disabledEndOfRunStalenessMarkers {
|
|
sl.endOfRunStaleness(last, ticker, sl.interval)
|
|
}
|
|
}
|
|
|
|
// scrapeAndReport performs a scrape and then appends the result to the storage
|
|
// together with reporting metrics, by using as few appenders as possible.
|
|
// In the happy scenario, a single appender is used.
|
|
// This function uses sl.appenderCtx instead of sl.ctx on purpose. A scrape should
|
|
// only be cancelled on shutdown, not on reloads.
|
|
func (sl *scrapeLoop) scrapeAndReport(last, appendTime time.Time, errc chan<- error) time.Time {
|
|
start := time.Now()
|
|
|
|
// Only record after the first scrape.
|
|
if !last.IsZero() {
|
|
sl.metrics.targetIntervalLength.WithLabelValues(sl.interval.String()).Observe(
|
|
time.Since(last).Seconds(),
|
|
)
|
|
}
|
|
|
|
var total, added, seriesAdded, bytesRead int
|
|
var err, appErr, scrapeErr error
|
|
|
|
app := sl.appender(sl.appenderCtx)
|
|
defer func() {
|
|
if err != nil {
|
|
app.Rollback()
|
|
return
|
|
}
|
|
err = app.Commit()
|
|
if err != nil {
|
|
level.Error(sl.l).Log("msg", "Scrape commit failed", "err", err)
|
|
}
|
|
}()
|
|
|
|
defer func() {
|
|
if err = sl.report(app, appendTime, time.Since(start), total, added, seriesAdded, bytesRead, scrapeErr); err != nil {
|
|
level.Warn(sl.l).Log("msg", "Appending scrape report failed", "err", err)
|
|
}
|
|
}()
|
|
|
|
if forcedErr := sl.getForcedError(); forcedErr != nil {
|
|
scrapeErr = forcedErr
|
|
// Add stale markers.
|
|
if _, _, _, err := sl.append(app, []byte{}, "", appendTime); err != nil {
|
|
app.Rollback()
|
|
app = sl.appender(sl.appenderCtx)
|
|
level.Warn(sl.l).Log("msg", "Append failed", "err", err)
|
|
}
|
|
if errc != nil {
|
|
errc <- forcedErr
|
|
}
|
|
|
|
return start
|
|
}
|
|
|
|
var contentType string
|
|
var resp *http.Response
|
|
var b []byte
|
|
var buf *bytes.Buffer
|
|
scrapeCtx, cancel := context.WithTimeout(sl.parentCtx, sl.timeout)
|
|
resp, scrapeErr = sl.scraper.scrape(scrapeCtx)
|
|
if scrapeErr == nil {
|
|
b = sl.buffers.Get(sl.lastScrapeSize).([]byte)
|
|
defer sl.buffers.Put(b)
|
|
buf = bytes.NewBuffer(b)
|
|
contentType, scrapeErr = sl.scraper.readResponse(scrapeCtx, resp, buf)
|
|
}
|
|
cancel()
|
|
|
|
if scrapeErr == nil {
|
|
b = buf.Bytes()
|
|
// NOTE: There were issues with misbehaving clients in the past
|
|
// that occasionally returned empty results. We don't want those
|
|
// to falsely reset our buffer size.
|
|
if len(b) > 0 {
|
|
sl.lastScrapeSize = len(b)
|
|
}
|
|
bytesRead = len(b)
|
|
} else {
|
|
level.Debug(sl.l).Log("msg", "Scrape failed", "err", scrapeErr)
|
|
if errc != nil {
|
|
errc <- scrapeErr
|
|
}
|
|
if errors.Is(scrapeErr, errBodySizeLimit) {
|
|
bytesRead = -1
|
|
}
|
|
}
|
|
|
|
// A failed scrape is the same as an empty scrape,
|
|
// we still call sl.append to trigger stale markers.
|
|
total, added, seriesAdded, appErr = sl.append(app, b, contentType, appendTime)
|
|
if appErr != nil {
|
|
app.Rollback()
|
|
app = sl.appender(sl.appenderCtx)
|
|
level.Debug(sl.l).Log("msg", "Append failed", "err", appErr)
|
|
// The append failed, probably due to a parse error or sample limit.
|
|
// Call sl.append again with an empty scrape to trigger stale markers.
|
|
if _, _, _, err := sl.append(app, []byte{}, "", appendTime); err != nil {
|
|
app.Rollback()
|
|
app = sl.appender(sl.appenderCtx)
|
|
level.Warn(sl.l).Log("msg", "Append failed", "err", err)
|
|
}
|
|
}
|
|
|
|
if scrapeErr == nil {
|
|
scrapeErr = appErr
|
|
}
|
|
|
|
return start
|
|
}
|
|
|
|
func (sl *scrapeLoop) setForcedError(err error) {
|
|
sl.forcedErrMtx.Lock()
|
|
defer sl.forcedErrMtx.Unlock()
|
|
sl.forcedErr = err
|
|
}
|
|
|
|
func (sl *scrapeLoop) getForcedError() error {
|
|
sl.forcedErrMtx.Lock()
|
|
defer sl.forcedErrMtx.Unlock()
|
|
return sl.forcedErr
|
|
}
|
|
|
|
func (sl *scrapeLoop) endOfRunStaleness(last time.Time, ticker *time.Ticker, interval time.Duration) {
|
|
// Scraping has stopped. We want to write stale markers but
|
|
// the target may be recreated, so we wait just over 2 scrape intervals
|
|
// before creating them.
|
|
// If the context is canceled, we presume the server is shutting down
|
|
// and will restart where is was. We do not attempt to write stale markers
|
|
// in this case.
|
|
|
|
if last.IsZero() {
|
|
// There never was a scrape, so there will be no stale markers.
|
|
return
|
|
}
|
|
|
|
// Wait for when the next scrape would have been, record its timestamp.
|
|
var staleTime time.Time
|
|
select {
|
|
case <-sl.parentCtx.Done():
|
|
return
|
|
case <-ticker.C:
|
|
staleTime = time.Now()
|
|
}
|
|
|
|
// Wait for when the next scrape would have been, if the target was recreated
|
|
// samples should have been ingested by now.
|
|
select {
|
|
case <-sl.parentCtx.Done():
|
|
return
|
|
case <-ticker.C:
|
|
}
|
|
|
|
// Wait for an extra 10% of the interval, just to be safe.
|
|
select {
|
|
case <-sl.parentCtx.Done():
|
|
return
|
|
case <-time.After(interval / 10):
|
|
}
|
|
|
|
// Call sl.append again with an empty scrape to trigger stale markers.
|
|
// If the target has since been recreated and scraped, the
|
|
// stale markers will be out of order and ignored.
|
|
// sl.context would have been cancelled, hence using sl.appenderCtx.
|
|
app := sl.appender(sl.appenderCtx)
|
|
var err error
|
|
defer func() {
|
|
if err != nil {
|
|
app.Rollback()
|
|
return
|
|
}
|
|
err = app.Commit()
|
|
if err != nil {
|
|
level.Warn(sl.l).Log("msg", "Stale commit failed", "err", err)
|
|
}
|
|
}()
|
|
if _, _, _, err = sl.append(app, []byte{}, "", staleTime); err != nil {
|
|
app.Rollback()
|
|
app = sl.appender(sl.appenderCtx)
|
|
level.Warn(sl.l).Log("msg", "Stale append failed", "err", err)
|
|
}
|
|
if err = sl.reportStale(app, staleTime); err != nil {
|
|
level.Warn(sl.l).Log("msg", "Stale report failed", "err", err)
|
|
}
|
|
}
|
|
|
|
// Stop the scraping. May still write data and stale markers after it has
|
|
// returned. Cancel the context to stop all writes.
|
|
func (sl *scrapeLoop) stop() {
|
|
sl.cancel()
|
|
<-sl.stopped
|
|
}
|
|
|
|
func (sl *scrapeLoop) disableEndOfRunStalenessMarkers() {
|
|
sl.disabledEndOfRunStalenessMarkers = true
|
|
}
|
|
|
|
func (sl *scrapeLoop) getCache() *scrapeCache {
|
|
return sl.cache
|
|
}
|
|
|
|
type appendErrors struct {
|
|
numOutOfOrder int
|
|
numDuplicates int
|
|
numOutOfBounds int
|
|
numExemplarOutOfOrder int
|
|
}
|
|
|
|
func (sl *scrapeLoop) append(app storage.Appender, b []byte, contentType string, ts time.Time) (total, added, seriesAdded int, err error) {
|
|
p, err := textparse.New(b, contentType, sl.scrapeClassicHistograms)
|
|
if err != nil {
|
|
level.Debug(sl.l).Log(
|
|
"msg", "Invalid content type on scrape, using prometheus parser as fallback.",
|
|
"content_type", contentType,
|
|
"err", err,
|
|
)
|
|
}
|
|
|
|
var (
|
|
defTime = timestamp.FromTime(ts)
|
|
appErrs = appendErrors{}
|
|
sampleLimitErr error
|
|
bucketLimitErr error
|
|
lset labels.Labels // escapes to heap so hoisted out of loop
|
|
e exemplar.Exemplar // escapes to heap so hoisted out of loop
|
|
meta metadata.Metadata
|
|
metadataChanged bool
|
|
)
|
|
|
|
exemplars := make([]exemplar.Exemplar, 1)
|
|
|
|
// updateMetadata updates the current iteration's metadata object and the
|
|
// metadataChanged value if we have metadata in the scrape cache AND the
|
|
// labelset is for a new series or the metadata for this series has just
|
|
// changed. It returns a boolean based on whether the metadata was updated.
|
|
updateMetadata := func(lset labels.Labels, isNewSeries bool) bool {
|
|
if !sl.appendMetadataToWAL {
|
|
return false
|
|
}
|
|
|
|
sl.cache.metaMtx.Lock()
|
|
defer sl.cache.metaMtx.Unlock()
|
|
metaEntry, metaOk := sl.cache.metadata[lset.Get(labels.MetricName)]
|
|
if metaOk && (isNewSeries || metaEntry.lastIterChange == sl.cache.iter) {
|
|
metadataChanged = true
|
|
meta.Type = metaEntry.Type
|
|
meta.Unit = metaEntry.Unit
|
|
meta.Help = metaEntry.Help
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Take an appender with limits.
|
|
app = appender(app, sl.sampleLimit, sl.bucketLimit)
|
|
|
|
defer func() {
|
|
if err != nil {
|
|
return
|
|
}
|
|
// Only perform cache cleaning if the scrape was not empty.
|
|
// An empty scrape (usually) is used to indicate a failed scrape.
|
|
sl.cache.iterDone(len(b) > 0)
|
|
}()
|
|
|
|
loop:
|
|
for {
|
|
var (
|
|
et textparse.Entry
|
|
sampleAdded, isHistogram bool
|
|
met []byte
|
|
parsedTimestamp *int64
|
|
val float64
|
|
h *histogram.Histogram
|
|
fh *histogram.FloatHistogram
|
|
)
|
|
if et, err = p.Next(); err != nil {
|
|
if errors.Is(err, io.EOF) {
|
|
err = nil
|
|
}
|
|
break
|
|
}
|
|
switch et {
|
|
case textparse.EntryType:
|
|
sl.cache.setType(p.Type())
|
|
continue
|
|
case textparse.EntryHelp:
|
|
sl.cache.setHelp(p.Help())
|
|
continue
|
|
case textparse.EntryUnit:
|
|
sl.cache.setUnit(p.Unit())
|
|
continue
|
|
case textparse.EntryComment:
|
|
continue
|
|
case textparse.EntryHistogram:
|
|
isHistogram = true
|
|
default:
|
|
}
|
|
total++
|
|
|
|
t := defTime
|
|
if isHistogram {
|
|
met, parsedTimestamp, h, fh = p.Histogram()
|
|
} else {
|
|
met, parsedTimestamp, val = p.Series()
|
|
}
|
|
if !sl.honorTimestamps {
|
|
parsedTimestamp = nil
|
|
}
|
|
if parsedTimestamp != nil {
|
|
t = *parsedTimestamp
|
|
}
|
|
|
|
// Zero metadata out for current iteration until it's resolved.
|
|
meta = metadata.Metadata{}
|
|
metadataChanged = false
|
|
|
|
if sl.cache.getDropped(met) {
|
|
continue
|
|
}
|
|
ce, ok := sl.cache.get(met)
|
|
var (
|
|
ref storage.SeriesRef
|
|
hash uint64
|
|
)
|
|
|
|
if ok {
|
|
ref = ce.ref
|
|
lset = ce.lset
|
|
|
|
// Update metadata only if it changed in the current iteration.
|
|
updateMetadata(lset, false)
|
|
} else {
|
|
p.Metric(&lset)
|
|
hash = lset.Hash()
|
|
|
|
// Hash label set as it is seen local to the target. Then add target labels
|
|
// and relabeling and store the final label set.
|
|
lset = sl.sampleMutator(lset)
|
|
|
|
// The label set may be set to empty to indicate dropping.
|
|
if lset.IsEmpty() {
|
|
sl.cache.addDropped(met)
|
|
continue
|
|
}
|
|
|
|
if !lset.Has(labels.MetricName) {
|
|
err = errNameLabelMandatory
|
|
break loop
|
|
}
|
|
if !lset.IsValid() {
|
|
err = fmt.Errorf("invalid metric name or label names: %s", lset.String())
|
|
break loop
|
|
}
|
|
|
|
// If any label limits is exceeded the scrape should fail.
|
|
if err = verifyLabelLimits(lset, sl.labelLimits); err != nil {
|
|
sl.metrics.targetScrapePoolExceededLabelLimits.Inc()
|
|
break loop
|
|
}
|
|
|
|
// Append metadata for new series if they were present.
|
|
updateMetadata(lset, true)
|
|
}
|
|
|
|
if isHistogram {
|
|
if h != nil {
|
|
ref, err = app.AppendHistogram(ref, lset, t, h, nil)
|
|
} else {
|
|
ref, err = app.AppendHistogram(ref, lset, t, nil, fh)
|
|
}
|
|
} else {
|
|
ref, err = app.Append(ref, lset, t, val)
|
|
}
|
|
sampleAdded, err = sl.checkAddError(ce, met, parsedTimestamp, err, &sampleLimitErr, &bucketLimitErr, &appErrs)
|
|
if err != nil {
|
|
if !errors.Is(err, storage.ErrNotFound) {
|
|
level.Debug(sl.l).Log("msg", "Unexpected error", "series", string(met), "err", err)
|
|
}
|
|
break loop
|
|
}
|
|
|
|
if !ok {
|
|
if parsedTimestamp == nil || sl.trackTimestampsStaleness {
|
|
// Bypass staleness logic if there is an explicit timestamp.
|
|
sl.cache.trackStaleness(hash, lset)
|
|
}
|
|
sl.cache.addRef(met, ref, lset, hash)
|
|
if sampleAdded && sampleLimitErr == nil && bucketLimitErr == nil {
|
|
seriesAdded++
|
|
}
|
|
}
|
|
|
|
// Increment added even if there's an error so we correctly report the
|
|
// number of samples remaining after relabeling.
|
|
added++
|
|
exemplars = exemplars[:0] // Reset and reuse the exemplar slice.
|
|
for hasExemplar := p.Exemplar(&e); hasExemplar; hasExemplar = p.Exemplar(&e) {
|
|
if !e.HasTs {
|
|
if isHistogram {
|
|
// We drop exemplars for native histograms if they don't have a timestamp.
|
|
// Missing timestamps are deliberately not supported as we want to start
|
|
// enforcing timestamps for exemplars as otherwise proper deduplication
|
|
// is inefficient and purely based on heuristics: we cannot distinguish
|
|
// between repeated exemplars and new instances with the same values.
|
|
// This is done silently without logs as it is not an error but out of spec.
|
|
// This does not affect classic histograms so that behaviour is unchanged.
|
|
e = exemplar.Exemplar{} // Reset for next time round loop.
|
|
continue
|
|
}
|
|
e.Ts = t
|
|
}
|
|
exemplars = append(exemplars, e)
|
|
e = exemplar.Exemplar{} // Reset for next time round loop.
|
|
}
|
|
// Sort so that checking for duplicates / out of order is more efficient during validation.
|
|
slices.SortFunc(exemplars, exemplar.Compare)
|
|
outOfOrderExemplars := 0
|
|
for _, e := range exemplars {
|
|
_, exemplarErr := app.AppendExemplar(ref, lset, e)
|
|
switch {
|
|
case exemplarErr == nil:
|
|
// Do nothing.
|
|
case errors.Is(exemplarErr, storage.ErrOutOfOrderExemplar):
|
|
outOfOrderExemplars++
|
|
default:
|
|
// Since exemplar storage is still experimental, we don't fail the scrape on ingestion errors.
|
|
level.Debug(sl.l).Log("msg", "Error while adding exemplar in AddExemplar", "exemplar", fmt.Sprintf("%+v", e), "err", exemplarErr)
|
|
}
|
|
}
|
|
if outOfOrderExemplars > 0 && outOfOrderExemplars == len(exemplars) {
|
|
// Only report out of order exemplars if all are out of order, otherwise this was a partial update
|
|
// to some existing set of exemplars.
|
|
appErrs.numExemplarOutOfOrder += outOfOrderExemplars
|
|
level.Debug(sl.l).Log("msg", "Out of order exemplars", "count", outOfOrderExemplars, "latest", fmt.Sprintf("%+v", exemplars[len(exemplars)-1]))
|
|
sl.metrics.targetScrapeExemplarOutOfOrder.Add(float64(outOfOrderExemplars))
|
|
}
|
|
|
|
if sl.appendMetadataToWAL && metadataChanged {
|
|
if _, merr := app.UpdateMetadata(ref, lset, meta); merr != nil {
|
|
// No need to fail the scrape on errors appending metadata.
|
|
level.Debug(sl.l).Log("msg", "Error when appending metadata in scrape loop", "ref", fmt.Sprintf("%d", ref), "metadata", fmt.Sprintf("%+v", meta), "err", merr)
|
|
}
|
|
}
|
|
}
|
|
if sampleLimitErr != nil {
|
|
if err == nil {
|
|
err = sampleLimitErr
|
|
}
|
|
// We only want to increment this once per scrape, so this is Inc'd outside the loop.
|
|
sl.metrics.targetScrapeSampleLimit.Inc()
|
|
}
|
|
if bucketLimitErr != nil {
|
|
if err == nil {
|
|
err = bucketLimitErr // If sample limit is hit, that error takes precedence.
|
|
}
|
|
// We only want to increment this once per scrape, so this is Inc'd outside the loop.
|
|
sl.metrics.targetScrapeNativeHistogramBucketLimit.Inc()
|
|
}
|
|
if appErrs.numOutOfOrder > 0 {
|
|
level.Warn(sl.l).Log("msg", "Error on ingesting out-of-order samples", "num_dropped", appErrs.numOutOfOrder)
|
|
}
|
|
if appErrs.numDuplicates > 0 {
|
|
level.Warn(sl.l).Log("msg", "Error on ingesting samples with different value but same timestamp", "num_dropped", appErrs.numDuplicates)
|
|
}
|
|
if appErrs.numOutOfBounds > 0 {
|
|
level.Warn(sl.l).Log("msg", "Error on ingesting samples that are too old or are too far into the future", "num_dropped", appErrs.numOutOfBounds)
|
|
}
|
|
if appErrs.numExemplarOutOfOrder > 0 {
|
|
level.Warn(sl.l).Log("msg", "Error on ingesting out-of-order exemplars", "num_dropped", appErrs.numExemplarOutOfOrder)
|
|
}
|
|
if err == nil {
|
|
sl.cache.forEachStale(func(lset labels.Labels) bool {
|
|
// Series no longer exposed, mark it stale.
|
|
_, err = app.Append(0, lset, defTime, math.Float64frombits(value.StaleNaN))
|
|
switch {
|
|
case errors.Is(err, storage.ErrOutOfOrderSample), errors.Is(err, storage.ErrDuplicateSampleForTimestamp):
|
|
// Do not count these in logging, as this is expected if a target
|
|
// goes away and comes back again with a new scrape loop.
|
|
err = nil
|
|
}
|
|
return err == nil
|
|
})
|
|
}
|
|
return
|
|
}
|
|
|
|
// Adds samples to the appender, checking the error, and then returns the # of samples added,
|
|
// whether the caller should continue to process more samples, and any sample or bucket limit errors.
|
|
func (sl *scrapeLoop) checkAddError(ce *cacheEntry, met []byte, tp *int64, err error, sampleLimitErr, bucketLimitErr *error, appErrs *appendErrors) (bool, error) {
|
|
switch {
|
|
case err == nil:
|
|
if (tp == nil || sl.trackTimestampsStaleness) && ce != nil {
|
|
sl.cache.trackStaleness(ce.hash, ce.lset)
|
|
}
|
|
return true, nil
|
|
case errors.Is(err, storage.ErrNotFound):
|
|
return false, storage.ErrNotFound
|
|
case errors.Is(err, storage.ErrOutOfOrderSample):
|
|
appErrs.numOutOfOrder++
|
|
level.Debug(sl.l).Log("msg", "Out of order sample", "series", string(met))
|
|
sl.metrics.targetScrapeSampleOutOfOrder.Inc()
|
|
return false, nil
|
|
case errors.Is(err, storage.ErrDuplicateSampleForTimestamp):
|
|
appErrs.numDuplicates++
|
|
level.Debug(sl.l).Log("msg", "Duplicate sample for timestamp", "series", string(met))
|
|
sl.metrics.targetScrapeSampleDuplicate.Inc()
|
|
return false, nil
|
|
case errors.Is(err, storage.ErrOutOfBounds):
|
|
appErrs.numOutOfBounds++
|
|
level.Debug(sl.l).Log("msg", "Out of bounds metric", "series", string(met))
|
|
sl.metrics.targetScrapeSampleOutOfBounds.Inc()
|
|
return false, nil
|
|
case errors.Is(err, errSampleLimit):
|
|
// Keep on parsing output if we hit the limit, so we report the correct
|
|
// total number of samples scraped.
|
|
*sampleLimitErr = err
|
|
return false, nil
|
|
case errors.Is(err, errBucketLimit):
|
|
// Keep on parsing output if we hit the limit, so we report the correct
|
|
// total number of samples scraped.
|
|
*bucketLimitErr = err
|
|
return false, nil
|
|
default:
|
|
return false, err
|
|
}
|
|
}
|
|
|
|
// The constants are suffixed with the invalid \xff unicode rune to avoid collisions
|
|
// with scraped metrics in the cache.
|
|
var (
|
|
scrapeHealthMetricName = []byte("up" + "\xff")
|
|
scrapeDurationMetricName = []byte("scrape_duration_seconds" + "\xff")
|
|
scrapeSamplesMetricName = []byte("scrape_samples_scraped" + "\xff")
|
|
samplesPostRelabelMetricName = []byte("scrape_samples_post_metric_relabeling" + "\xff")
|
|
scrapeSeriesAddedMetricName = []byte("scrape_series_added" + "\xff")
|
|
scrapeTimeoutMetricName = []byte("scrape_timeout_seconds" + "\xff")
|
|
scrapeSampleLimitMetricName = []byte("scrape_sample_limit" + "\xff")
|
|
scrapeBodySizeBytesMetricName = []byte("scrape_body_size_bytes" + "\xff")
|
|
)
|
|
|
|
func (sl *scrapeLoop) report(app storage.Appender, start time.Time, duration time.Duration, scraped, added, seriesAdded, bytes int, scrapeErr error) (err error) {
|
|
sl.scraper.Report(start, duration, scrapeErr)
|
|
|
|
ts := timestamp.FromTime(start)
|
|
|
|
var health float64
|
|
if scrapeErr == nil {
|
|
health = 1
|
|
}
|
|
|
|
if err = sl.addReportSample(app, scrapeHealthMetricName, ts, health); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, scrapeDurationMetricName, ts, duration.Seconds()); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, scrapeSamplesMetricName, ts, float64(scraped)); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, samplesPostRelabelMetricName, ts, float64(added)); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, scrapeSeriesAddedMetricName, ts, float64(seriesAdded)); err != nil {
|
|
return
|
|
}
|
|
if sl.reportExtraMetrics {
|
|
if err = sl.addReportSample(app, scrapeTimeoutMetricName, ts, sl.timeout.Seconds()); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, scrapeSampleLimitMetricName, ts, float64(sl.sampleLimit)); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, scrapeBodySizeBytesMetricName, ts, float64(bytes)); err != nil {
|
|
return
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func (sl *scrapeLoop) reportStale(app storage.Appender, start time.Time) (err error) {
|
|
ts := timestamp.FromTime(start)
|
|
|
|
stale := math.Float64frombits(value.StaleNaN)
|
|
|
|
if err = sl.addReportSample(app, scrapeHealthMetricName, ts, stale); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, scrapeDurationMetricName, ts, stale); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, scrapeSamplesMetricName, ts, stale); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, samplesPostRelabelMetricName, ts, stale); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, scrapeSeriesAddedMetricName, ts, stale); err != nil {
|
|
return
|
|
}
|
|
if sl.reportExtraMetrics {
|
|
if err = sl.addReportSample(app, scrapeTimeoutMetricName, ts, stale); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, scrapeSampleLimitMetricName, ts, stale); err != nil {
|
|
return
|
|
}
|
|
if err = sl.addReportSample(app, scrapeBodySizeBytesMetricName, ts, stale); err != nil {
|
|
return
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func (sl *scrapeLoop) addReportSample(app storage.Appender, s []byte, t int64, v float64) error {
|
|
ce, ok := sl.cache.get(s)
|
|
var ref storage.SeriesRef
|
|
var lset labels.Labels
|
|
if ok {
|
|
ref = ce.ref
|
|
lset = ce.lset
|
|
} else {
|
|
// The constants are suffixed with the invalid \xff unicode rune to avoid collisions
|
|
// with scraped metrics in the cache.
|
|
// We have to drop it when building the actual metric.
|
|
lset = labels.FromStrings(labels.MetricName, string(s[:len(s)-1]))
|
|
lset = sl.reportSampleMutator(lset)
|
|
}
|
|
|
|
ref, err := app.Append(ref, lset, t, v)
|
|
switch {
|
|
case err == nil:
|
|
if !ok {
|
|
sl.cache.addRef(s, ref, lset, lset.Hash())
|
|
}
|
|
return nil
|
|
case errors.Is(err, storage.ErrOutOfOrderSample), errors.Is(err, storage.ErrDuplicateSampleForTimestamp):
|
|
// Do not log here, as this is expected if a target goes away and comes back
|
|
// again with a new scrape loop.
|
|
return nil
|
|
default:
|
|
return err
|
|
}
|
|
}
|
|
|
|
// zeroConfig returns a new scrape config that only contains configuration items
|
|
// that alter metrics.
|
|
func zeroConfig(c *config.ScrapeConfig) *config.ScrapeConfig {
|
|
z := *c
|
|
// We zero out the fields that for sure don't affect scrape.
|
|
z.ScrapeInterval = 0
|
|
z.ScrapeTimeout = 0
|
|
z.SampleLimit = 0
|
|
z.HTTPClientConfig = config_util.HTTPClientConfig{}
|
|
return &z
|
|
}
|
|
|
|
// reusableCache compares two scrape config and tells whether the cache is still
|
|
// valid.
|
|
func reusableCache(r, l *config.ScrapeConfig) bool {
|
|
if r == nil || l == nil {
|
|
return false
|
|
}
|
|
return reflect.DeepEqual(zeroConfig(r), zeroConfig(l))
|
|
}
|
|
|
|
// CtxKey is a dedicated type for keys of context-embedded values propagated
|
|
// with the scrape context.
|
|
type ctxKey int
|
|
|
|
// Valid CtxKey values.
|
|
const (
|
|
ctxKeyMetadata ctxKey = iota + 1
|
|
ctxKeyTarget
|
|
)
|
|
|
|
func ContextWithMetricMetadataStore(ctx context.Context, s MetricMetadataStore) context.Context {
|
|
return context.WithValue(ctx, ctxKeyMetadata, s)
|
|
}
|
|
|
|
func MetricMetadataStoreFromContext(ctx context.Context) (MetricMetadataStore, bool) {
|
|
s, ok := ctx.Value(ctxKeyMetadata).(MetricMetadataStore)
|
|
return s, ok
|
|
}
|
|
|
|
func ContextWithTarget(ctx context.Context, t *Target) context.Context {
|
|
return context.WithValue(ctx, ctxKeyTarget, t)
|
|
}
|
|
|
|
func TargetFromContext(ctx context.Context) (*Target, bool) {
|
|
t, ok := ctx.Value(ctxKeyTarget).(*Target)
|
|
return t, ok
|
|
}
|