mirror of
https://github.com/prometheus/prometheus.git
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Append metadata to the WAL in the scrape loop (#10312)
* Append metadata to the WAL Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Remove extra whitespace; Reword some docstrings and comments Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Use RLock() for hasNewMetadata check Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Use single byte for metric type in RefMetadata Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Update proposed WAL format for single-byte type metadata Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Address first round of review comments Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Amend description of metadata in wal.md Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Correct key used to retrieve metadata from cache When we're setting metadata entries in the scrapeCace, we're using the p.Help(), p.Unit(), p.Type() helpers, which retrieve the series name and use it as the cache key. When checking for cache entries though, we used p.Series() as the key, which included the metric name _with_ its labels. That meant that we were never actually hitting the cache. We're fixing this by utiling the __name__ internal label for correctly getting the cache entries after they've been set by setHelp(), setType() or setUnit(). Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Put feature behind a feature flag Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Reorder WAL format document Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Fix CR comments Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Extract logic about changing metadata in an anonymous function Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Implement new proposed WAL format and amend relevant tests Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Use 'const' for metadata field names Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Apply metadata to head memSeries in Commit, not in AppendMetadata Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Add docstring and rename extracted helper in scrape.go Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Fix review comments around TestMetadata* tests Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Rebase with merged TSDB changes; fix duplicate definitions after rebase Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Remove leftover changes on db_test.go Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Rename feature flag Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Simplify updateMetadata helper function Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> * Remove extra newline Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com> Signed-off-by: Paschalis Tsilias <paschalist0@gmail.com>
This commit is contained in:
Paschalis Tsilias
GitHub
parent
314aa45c2c
commit
5a8e202f94
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@ -180,6 +180,9 @@ func (c *flagConfig) setFeatureListOptions(logger log.Logger) error {
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case "extra-scrape-metrics":
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c.scrape.ExtraMetrics = true
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level.Info(logger).Log("msg", "Experimental additional scrape metrics enabled")
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case "metadata-storage":
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c.scrape.EnableMetadataStorage = true
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level.Info(logger).Log("msg", "Experimental in-memory metadata storage enabled")
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case "new-service-discovery-manager":
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c.enableNewSDManager = true
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level.Info(logger).Log("msg", "Experimental service discovery manager")
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@ -129,6 +129,9 @@ type Options struct {
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// Option used by downstream scraper users like OpenTelemetry Collector
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// to help lookup metric metadata. Should be false for Prometheus.
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PassMetadataInContext bool
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// Option to enable the experimental in-memory metadata storage and append
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// metadata to the WAL.
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EnableMetadataStorage bool
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// Option to increase the interval used by scrape manager to throttle target groups updates.
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DiscoveryReloadInterval model.Duration
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@ -41,6 +41,7 @@ import (
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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/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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@ -318,6 +319,7 @@ func newScrapePool(cfg *config.ScrapeConfig, app storage.Appendable, jitterSeed
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opts.interval,
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opts.timeout,
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options.ExtraMetrics,
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options.EnableMetadataStorage,
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opts.target,
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cache,
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options.PassMetadataInContext,
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@ -844,6 +846,7 @@ type cacheEntry struct {
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lastIter uint64
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hash uint64
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lset labels.Labels
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meta metadata.Metadata
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}
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type scrapeLoop struct {
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@ -874,6 +877,7 @@ type scrapeLoop struct {
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disabledEndOfRunStalenessMarkers bool
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reportExtraMetrics bool
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appendMetadataToWAL bool
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}
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// scrapeCache tracks mappings of exposed metric strings to label sets and
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@ -906,15 +910,15 @@ type scrapeCache struct {
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// metaEntry holds meta information about a metric.
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type metaEntry struct {
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metadata.Metadata
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lastIter uint64 // Last scrape iteration the entry was observed at.
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typ textparse.MetricType
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help string
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unit string
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lastIterChange uint64 // Last scrape iteration the entry was changed at.
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}
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func (m *metaEntry) size() int {
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// The attribute lastIter although part of the struct it is not metadata.
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return len(m.help) + len(m.unit) + len(m.typ)
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return len(m.Help) + len(m.Unit) + len(m.Type)
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}
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func newScrapeCache() *scrapeCache {
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@ -988,11 +992,11 @@ func (c *scrapeCache) get(met string) (*cacheEntry, bool) {
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return e, true
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}
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func (c *scrapeCache) addRef(met string, ref storage.SeriesRef, lset labels.Labels, hash uint64) {
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func (c *scrapeCache) addRef(met string, ref storage.SeriesRef, lset labels.Labels, meta metadata.Metadata, hash uint64) {
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if ref == 0 {
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return
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}
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c.series[met] = &cacheEntry{ref: ref, lastIter: c.iter, lset: lset, hash: hash}
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c.series[met] = &cacheEntry{ref: ref, lastIter: c.iter, lset: lset, meta: meta, hash: hash}
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}
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func (c *scrapeCache) addDropped(met string) {
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@ -1027,10 +1031,13 @@ func (c *scrapeCache) setType(metric []byte, t textparse.MetricType) {
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e, ok := c.metadata[yoloString(metric)]
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if !ok {
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e = &metaEntry{typ: textparse.MetricTypeUnknown}
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e = &metaEntry{Metadata: metadata.Metadata{Type: textparse.MetricTypeUnknown}}
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c.metadata[string(metric)] = e
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}
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e.typ = t
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if e.Type != t {
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e.Type = t
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e.lastIterChange = c.iter
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}
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e.lastIter = c.iter
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c.metaMtx.Unlock()
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@ -1041,11 +1048,12 @@ func (c *scrapeCache) setHelp(metric, help []byte) {
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e, ok := c.metadata[yoloString(metric)]
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if !ok {
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e = &metaEntry{typ: textparse.MetricTypeUnknown}
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e = &metaEntry{Metadata: metadata.Metadata{Type: textparse.MetricTypeUnknown}}
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c.metadata[string(metric)] = e
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}
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if e.help != yoloString(help) {
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e.help = string(help)
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if e.Help != yoloString(help) {
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e.Help = string(help)
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e.lastIterChange = c.iter
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}
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e.lastIter = c.iter
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@ -1057,11 +1065,12 @@ func (c *scrapeCache) setUnit(metric, unit []byte) {
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e, ok := c.metadata[yoloString(metric)]
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if !ok {
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e = &metaEntry{typ: textparse.MetricTypeUnknown}
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e = &metaEntry{Metadata: metadata.Metadata{Type: textparse.MetricTypeUnknown}}
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c.metadata[string(metric)] = e
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}
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if e.unit != yoloString(unit) {
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e.unit = string(unit)
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if e.Unit != yoloString(unit) {
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e.Unit = string(unit)
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e.lastIterChange = c.iter
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}
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e.lastIter = c.iter
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@ -1078,9 +1087,9 @@ func (c *scrapeCache) GetMetadata(metric string) (MetricMetadata, bool) {
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}
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return MetricMetadata{
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Metric: metric,
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Type: m.typ,
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Help: m.help,
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Unit: m.unit,
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Type: m.Type,
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Help: m.Help,
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Unit: m.Unit,
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}, true
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}
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@ -1093,9 +1102,9 @@ func (c *scrapeCache) ListMetadata() []MetricMetadata {
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for m, e := range c.metadata {
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res = append(res, MetricMetadata{
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Metric: m,
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Type: e.typ,
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Help: e.help,
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Unit: e.unit,
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Type: e.Type,
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Help: e.Help,
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Unit: e.Unit,
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})
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}
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return res
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@ -1135,6 +1144,7 @@ func newScrapeLoop(ctx context.Context,
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interval time.Duration,
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timeout time.Duration,
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reportExtraMetrics bool,
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appendMetadataToWAL bool,
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target *Target,
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metricMetadataStore MetricMetadataStore,
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passMetadataInContext bool,
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@ -1178,6 +1188,7 @@ func newScrapeLoop(ctx context.Context,
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interval: interval,
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timeout: timeout,
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reportExtraMetrics: reportExtraMetrics,
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appendMetadataToWAL: appendMetadataToWAL,
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}
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sl.ctx, sl.cancel = context.WithCancel(ctx)
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@ -1461,8 +1472,33 @@ func (sl *scrapeLoop) append(app storage.Appender, b []byte, contentType string,
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appErrs = appendErrors{}
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sampleLimitErr error
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e exemplar.Exemplar // escapes to heap so hoisted out of loop
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meta metadata.Metadata
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metadataChanged bool
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)
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// updateMetadata updates the current iteration's metadata object and the
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// metadataChanged value if we have metadata in the scrape cache AND the
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// labelset is for a new series or the metadata for this series has just
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// changed. It returns a boolean based on whether the metadata was updated.
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updateMetadata := func(lset labels.Labels, isNewSeries bool) bool {
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if !sl.appendMetadataToWAL {
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return false
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}
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sl.cache.metaMtx.Lock()
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defer sl.cache.metaMtx.Unlock()
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metaEntry, metaOk := sl.cache.metadata[yoloString([]byte(lset.Get(labels.MetricName)))]
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if metaOk && (isNewSeries || metaEntry.lastIterChange == sl.cache.iter) {
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metadataChanged = true
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meta.Type = metaEntry.Type
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meta.Unit = metaEntry.Unit
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meta.Help = metaEntry.Help
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return true
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}
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sl.cache.metaMtx.Unlock()
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return false
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}
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// Take an appender with limits.
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app = appender(app, sl.sampleLimit)
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@ -1512,6 +1548,10 @@ loop:
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t = *tp
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}
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// Zero metadata out for current iteration until it's resolved.
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meta = metadata.Metadata{}
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metadataChanged = false
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if sl.cache.getDropped(yoloString(met)) {
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continue
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}
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@ -1526,6 +1566,9 @@ loop:
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if ok {
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ref = ce.ref
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lset = ce.lset
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// Update metadata only if it changed in the current iteration.
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updateMetadata(lset, false)
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} else {
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mets = p.Metric(&lset)
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hash = lset.Hash()
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@ -1550,6 +1593,9 @@ loop:
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targetScrapePoolExceededLabelLimits.Inc()
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break loop
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}
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// Append metadata for new series if they were present.
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updateMetadata(lset, true)
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}
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ref, err = app.Append(ref, lset, t, v)
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@ -1566,7 +1612,7 @@ loop:
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// Bypass staleness logic if there is an explicit timestamp.
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sl.cache.trackStaleness(hash, lset)
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}
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sl.cache.addRef(mets, ref, lset, hash)
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sl.cache.addRef(mets, ref, lset, meta, hash)
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if sampleAdded && sampleLimitErr == nil {
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seriesAdded++
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}
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@ -1589,6 +1635,12 @@ loop:
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e = exemplar.Exemplar{} // reset for next time round loop
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}
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if sl.appendMetadataToWAL && metadataChanged {
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if _, merr := app.UpdateMetadata(ref, lset, meta); merr != nil {
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// No need to fail the scrape on errors appending metadata.
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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)
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}
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}
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}
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if sampleLimitErr != nil {
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if err == nil {
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@ -1786,7 +1838,7 @@ func (sl *scrapeLoop) addReportSample(app storage.Appender, s string, t int64, v
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switch errors.Cause(err) {
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case nil:
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if !ok {
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sl.cache.addRef(s, ref, lset, lset.Hash())
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sl.cache.addRef(s, ref, lset, metadata.Metadata{}, lset.Hash())
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}
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return nil
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case storage.ErrOutOfOrderSample, storage.ErrDuplicateSampleForTimestamp:
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@ -39,6 +39,7 @@ import (
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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/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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@ -624,6 +625,7 @@ func TestScrapeLoopStopBeforeRun(t *testing.T) {
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1,
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0,
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false,
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false,
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nil,
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nil,
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false,
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@ -696,6 +698,7 @@ func TestScrapeLoopStop(t *testing.T) {
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10*time.Millisecond,
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time.Hour,
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false,
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false,
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nil,
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nil,
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false,
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@ -771,6 +774,7 @@ func TestScrapeLoopRun(t *testing.T) {
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time.Second,
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time.Hour,
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false,
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false,
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nil,
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nil,
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false,
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@ -826,6 +830,7 @@ func TestScrapeLoopRun(t *testing.T) {
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time.Second,
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100*time.Millisecond,
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false,
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false,
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nil,
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nil,
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false,
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@ -885,6 +890,7 @@ func TestScrapeLoopForcedErr(t *testing.T) {
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time.Second,
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time.Hour,
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false,
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false,
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nil,
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nil,
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false,
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@ -943,6 +949,7 @@ func TestScrapeLoopMetadata(t *testing.T) {
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0,
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0,
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false,
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false,
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nil,
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nil,
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false,
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@ -1000,6 +1007,7 @@ func simpleTestScrapeLoop(t testing.TB) (context.Context, *scrapeLoop) {
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0,
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0,
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false,
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false,
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nil,
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nil,
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false,
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@ -1093,6 +1101,7 @@ func TestScrapeLoopRunCreatesStaleMarkersOnFailedScrape(t *testing.T) {
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10*time.Millisecond,
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time.Hour,
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false,
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false,
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nil,
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nil,
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false,
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@ -1155,6 +1164,7 @@ func TestScrapeLoopRunCreatesStaleMarkersOnParseFailure(t *testing.T) {
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10*time.Millisecond,
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time.Hour,
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false,
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false,
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nil,
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nil,
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false,
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@ -1221,6 +1231,7 @@ func TestScrapeLoopCache(t *testing.T) {
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10*time.Millisecond,
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time.Hour,
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false,
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false,
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nil,
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nil,
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false,
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@ -1303,6 +1314,7 @@ func TestScrapeLoopCacheMemoryExhaustionProtection(t *testing.T) {
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10*time.Millisecond,
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time.Hour,
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false,
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false,
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nil,
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nil,
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false,
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@ -1417,6 +1429,7 @@ func TestScrapeLoopAppend(t *testing.T) {
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0,
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0,
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false,
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false,
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nil,
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nil,
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false,
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@ -1507,7 +1520,7 @@ func TestScrapeLoopAppendForConflictingPrefixedLabels(t *testing.T) {
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return mutateSampleLabels(l, &Target{labels: labels.FromStrings(tc.targetLabels...)}, false, nil)
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},
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nil,
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func(ctx context.Context) storage.Appender { return app }, nil, 0, true, 0, nil, 0, 0, false, nil, nil, false,
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func(ctx context.Context) storage.Appender { return app }, nil, 0, true, 0, nil, 0, 0, false, false, nil, nil, false,
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)
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slApp := sl.appender(context.Background())
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_, _, _, err := sl.append(slApp, []byte(tc.exposedLabels), "", time.Date(2000, 1, 1, 1, 0, 0, 0, time.UTC))
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@ -1543,6 +1556,7 @@ func TestScrapeLoopAppendCacheEntryButErrNotFound(t *testing.T) {
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0,
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0,
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false,
|
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false,
|
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nil,
|
||||
nil,
|
||||
false,
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||||
|
|
@ -1555,12 +1569,13 @@ func TestScrapeLoopAppendCacheEntryButErrNotFound(t *testing.T) {
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require.NoError(t, warning)
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|
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var lset labels.Labels
|
||||
var meta metadata.Metadata
|
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p.Next()
|
||||
mets := p.Metric(&lset)
|
||||
hash := lset.Hash()
|
||||
|
||||
// Create a fake entry in the cache
|
||||
sl.cache.addRef(mets, fakeRef, lset, hash)
|
||||
sl.cache.addRef(mets, fakeRef, lset, meta, hash)
|
||||
now := time.Now()
|
||||
|
||||
slApp := sl.appender(context.Background())
|
||||
|
|
@ -1601,6 +1616,7 @@ func TestScrapeLoopAppendSampleLimit(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -1678,6 +1694,7 @@ func TestScrapeLoop_ChangingMetricString(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -1726,6 +1743,7 @@ func TestScrapeLoopAppendStaleness(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -1777,6 +1795,7 @@ func TestScrapeLoopAppendNoStalenessIfTimestamp(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -1888,6 +1907,7 @@ metric_total{n="2"} 2 # {t="2"} 2.0 20000
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -1953,6 +1973,7 @@ func TestScrapeLoopAppendExemplarSeries(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -2005,6 +2026,7 @@ func TestScrapeLoopRunReportsTargetDownOnScrapeError(t *testing.T) {
|
|||
10*time.Millisecond,
|
||||
time.Hour,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -2041,6 +2063,7 @@ func TestScrapeLoopRunReportsTargetDownOnInvalidUTF8(t *testing.T) {
|
|||
10*time.Millisecond,
|
||||
time.Hour,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -2090,6 +2113,7 @@ func TestScrapeLoopAppendGracefullyIfAmendOrOutOfOrderOrOutOfBounds(t *testing.T
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -2135,6 +2159,7 @@ func TestScrapeLoopOutOfBoundsTimeError(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -2392,6 +2417,7 @@ func TestScrapeLoop_RespectTimestamps(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -2433,6 +2459,7 @@ func TestScrapeLoop_DiscardTimestamps(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -2473,6 +2500,7 @@ func TestScrapeLoopDiscardDuplicateLabels(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -2531,6 +2559,7 @@ func TestScrapeLoopDiscardUnnamedMetrics(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -2807,6 +2836,7 @@ func TestScrapeAddFast(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -2898,6 +2928,7 @@ func TestScrapeReportSingleAppender(t *testing.T) {
|
|||
10*time.Millisecond,
|
||||
time.Hour,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
@ -3100,6 +3131,7 @@ func TestScrapeLoopLabelLimit(t *testing.T) {
|
|||
0,
|
||||
0,
|
||||
false,
|
||||
false,
|
||||
nil,
|
||||
nil,
|
||||
false,
|
||||
|
|
|
|||
Loading…
Reference in a new issue