mirror of
https://github.com/prometheus/node_exporter.git
synced 2024-12-28 06:59:44 -08:00
c23b76bfbb
* Bump exporter-toolkit to the latest release. * Use new toolkit landing page function. * Update kingpin flags. Signed-off-by: Ben Kochie <superq@gmail.com>
363 lines
11 KiB
Go
363 lines
11 KiB
Go
// Copyright 2017 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
//go:build !nobcache
|
|
// +build !nobcache
|
|
|
|
package collector
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/alecthomas/kingpin/v2"
|
|
"github.com/go-kit/log"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/procfs/bcache"
|
|
)
|
|
|
|
var (
|
|
priorityStats = kingpin.Flag("collector.bcache.priorityStats", "Expose expensive priority stats.").Bool()
|
|
)
|
|
|
|
func init() {
|
|
registerCollector("bcache", defaultEnabled, NewBcacheCollector)
|
|
}
|
|
|
|
// A bcacheCollector is a Collector which gathers metrics from Linux bcache.
|
|
type bcacheCollector struct {
|
|
fs bcache.FS
|
|
logger log.Logger
|
|
}
|
|
|
|
// NewBcacheCollector returns a newly allocated bcacheCollector.
|
|
// It exposes a number of Linux bcache statistics.
|
|
func NewBcacheCollector(logger log.Logger) (Collector, error) {
|
|
fs, err := bcache.NewFS(*sysPath)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to open sysfs: %w", err)
|
|
}
|
|
|
|
return &bcacheCollector{
|
|
fs: fs,
|
|
logger: logger,
|
|
}, nil
|
|
}
|
|
|
|
// Update reads and exposes bcache stats.
|
|
// It implements the Collector interface.
|
|
func (c *bcacheCollector) Update(ch chan<- prometheus.Metric) error {
|
|
var stats []*bcache.Stats
|
|
var err error
|
|
if *priorityStats {
|
|
stats, err = c.fs.Stats()
|
|
} else {
|
|
stats, err = c.fs.StatsWithoutPriority()
|
|
}
|
|
if err != nil {
|
|
return fmt.Errorf("failed to retrieve bcache stats: %w", err)
|
|
}
|
|
|
|
for _, s := range stats {
|
|
c.updateBcacheStats(ch, s)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type bcacheMetric struct {
|
|
name string
|
|
desc string
|
|
value float64
|
|
metricType prometheus.ValueType
|
|
extraLabel []string
|
|
extraLabelValue string
|
|
}
|
|
|
|
func bcachePeriodStatsToMetric(ps *bcache.PeriodStats, labelValue string) []bcacheMetric {
|
|
label := []string{"backing_device"}
|
|
|
|
metrics := []bcacheMetric{
|
|
{
|
|
name: "bypassed_bytes_total",
|
|
desc: "Amount of IO (both reads and writes) that has bypassed the cache.",
|
|
value: float64(ps.Bypassed),
|
|
metricType: prometheus.CounterValue,
|
|
extraLabel: label,
|
|
extraLabelValue: labelValue,
|
|
},
|
|
{
|
|
name: "cache_hits_total",
|
|
desc: "Hits counted per individual IO as bcache sees them.",
|
|
value: float64(ps.CacheHits),
|
|
metricType: prometheus.CounterValue,
|
|
extraLabel: label,
|
|
extraLabelValue: labelValue,
|
|
},
|
|
{
|
|
name: "cache_misses_total",
|
|
desc: "Misses counted per individual IO as bcache sees them.",
|
|
value: float64(ps.CacheMisses),
|
|
metricType: prometheus.CounterValue,
|
|
extraLabel: label,
|
|
extraLabelValue: labelValue,
|
|
},
|
|
{
|
|
name: "cache_bypass_hits_total",
|
|
desc: "Hits for IO intended to skip the cache.",
|
|
value: float64(ps.CacheBypassHits),
|
|
metricType: prometheus.CounterValue,
|
|
extraLabel: label,
|
|
extraLabelValue: labelValue,
|
|
},
|
|
{
|
|
name: "cache_bypass_misses_total",
|
|
desc: "Misses for IO intended to skip the cache.",
|
|
value: float64(ps.CacheBypassMisses),
|
|
metricType: prometheus.CounterValue,
|
|
extraLabel: label,
|
|
extraLabelValue: labelValue,
|
|
},
|
|
{
|
|
name: "cache_miss_collisions_total",
|
|
desc: "Instances where data insertion from cache miss raced with write (data already present).",
|
|
value: float64(ps.CacheMissCollisions),
|
|
metricType: prometheus.CounterValue,
|
|
extraLabel: label,
|
|
extraLabelValue: labelValue,
|
|
},
|
|
{
|
|
name: "cache_readaheads_total",
|
|
desc: "Count of times readahead occurred.",
|
|
value: float64(ps.CacheReadaheads),
|
|
metricType: prometheus.CounterValue,
|
|
extraLabel: label,
|
|
extraLabelValue: labelValue,
|
|
},
|
|
}
|
|
return metrics
|
|
}
|
|
|
|
// UpdateBcacheStats collects statistics for one bcache ID.
|
|
func (c *bcacheCollector) updateBcacheStats(ch chan<- prometheus.Metric, s *bcache.Stats) {
|
|
|
|
const (
|
|
subsystem = "bcache"
|
|
)
|
|
|
|
var (
|
|
devLabel = []string{"uuid"}
|
|
allMetrics []bcacheMetric
|
|
metrics []bcacheMetric
|
|
)
|
|
|
|
allMetrics = []bcacheMetric{
|
|
// metrics in /sys/fs/bcache/<uuid>/
|
|
{
|
|
name: "average_key_size_sectors",
|
|
desc: "Average data per key in the btree (sectors).",
|
|
value: float64(s.Bcache.AverageKeySize),
|
|
metricType: prometheus.GaugeValue,
|
|
},
|
|
{
|
|
name: "btree_cache_size_bytes",
|
|
desc: "Amount of memory currently used by the btree cache.",
|
|
value: float64(s.Bcache.BtreeCacheSize),
|
|
metricType: prometheus.GaugeValue,
|
|
},
|
|
{
|
|
name: "cache_available_percent",
|
|
desc: "Percentage of cache device without dirty data, usable for writeback (may contain clean cached data).",
|
|
value: float64(s.Bcache.CacheAvailablePercent),
|
|
metricType: prometheus.GaugeValue,
|
|
},
|
|
{
|
|
name: "congested",
|
|
desc: "Congestion.",
|
|
value: float64(s.Bcache.Congested),
|
|
metricType: prometheus.GaugeValue,
|
|
},
|
|
{
|
|
name: "root_usage_percent",
|
|
desc: "Percentage of the root btree node in use (tree depth increases if too high).",
|
|
value: float64(s.Bcache.RootUsagePercent),
|
|
metricType: prometheus.GaugeValue,
|
|
},
|
|
{
|
|
name: "tree_depth",
|
|
desc: "Depth of the btree.",
|
|
value: float64(s.Bcache.TreeDepth),
|
|
metricType: prometheus.GaugeValue,
|
|
},
|
|
// metrics in /sys/fs/bcache/<uuid>/internal/
|
|
{
|
|
name: "active_journal_entries",
|
|
desc: "Number of journal entries that are newer than the index.",
|
|
value: float64(s.Bcache.Internal.ActiveJournalEntries),
|
|
metricType: prometheus.GaugeValue,
|
|
},
|
|
{
|
|
name: "btree_nodes",
|
|
desc: "Total nodes in the btree.",
|
|
value: float64(s.Bcache.Internal.BtreeNodes),
|
|
metricType: prometheus.GaugeValue,
|
|
},
|
|
{
|
|
name: "btree_read_average_duration_seconds",
|
|
desc: "Average btree read duration.",
|
|
value: float64(s.Bcache.Internal.BtreeReadAverageDurationNanoSeconds) * 1e-9,
|
|
metricType: prometheus.GaugeValue,
|
|
},
|
|
{
|
|
name: "cache_read_races_total",
|
|
desc: "Counts instances where while data was being read from the cache, the bucket was reused and invalidated - i.e. where the pointer was stale after the read completed.",
|
|
value: float64(s.Bcache.Internal.CacheReadRaces),
|
|
metricType: prometheus.CounterValue,
|
|
},
|
|
}
|
|
|
|
for _, bdev := range s.Bdevs {
|
|
// metrics in /sys/fs/bcache/<uuid>/<bdev>/
|
|
metrics = []bcacheMetric{
|
|
{
|
|
name: "dirty_data_bytes",
|
|
desc: "Amount of dirty data for this backing device in the cache.",
|
|
value: float64(bdev.DirtyData),
|
|
metricType: prometheus.GaugeValue,
|
|
extraLabel: []string{"backing_device"},
|
|
extraLabelValue: bdev.Name,
|
|
},
|
|
{
|
|
name: "dirty_target_bytes",
|
|
desc: "Current dirty data target threshold for this backing device in bytes.",
|
|
value: float64(bdev.WritebackRateDebug.Target),
|
|
metricType: prometheus.GaugeValue,
|
|
extraLabel: []string{"backing_device"},
|
|
extraLabelValue: bdev.Name,
|
|
},
|
|
{
|
|
name: "writeback_rate",
|
|
desc: "Current writeback rate for this backing device in bytes.",
|
|
value: float64(bdev.WritebackRateDebug.Rate),
|
|
metricType: prometheus.GaugeValue,
|
|
extraLabel: []string{"backing_device"},
|
|
extraLabelValue: bdev.Name,
|
|
},
|
|
{
|
|
name: "writeback_rate_proportional_term",
|
|
desc: "Current result of proportional controller, part of writeback rate",
|
|
value: float64(bdev.WritebackRateDebug.Proportional),
|
|
metricType: prometheus.GaugeValue,
|
|
extraLabel: []string{"backing_device"},
|
|
extraLabelValue: bdev.Name,
|
|
},
|
|
{
|
|
name: "writeback_rate_integral_term",
|
|
desc: "Current result of integral controller, part of writeback rate",
|
|
value: float64(bdev.WritebackRateDebug.Integral),
|
|
metricType: prometheus.GaugeValue,
|
|
extraLabel: []string{"backing_device"},
|
|
extraLabelValue: bdev.Name,
|
|
},
|
|
{
|
|
name: "writeback_change",
|
|
desc: "Last writeback rate change step for this backing device.",
|
|
value: float64(bdev.WritebackRateDebug.Change),
|
|
metricType: prometheus.GaugeValue,
|
|
extraLabel: []string{"backing_device"},
|
|
extraLabelValue: bdev.Name,
|
|
},
|
|
}
|
|
allMetrics = append(allMetrics, metrics...)
|
|
|
|
// metrics in /sys/fs/bcache/<uuid>/<bdev>/stats_total
|
|
metrics := bcachePeriodStatsToMetric(&bdev.Total, bdev.Name)
|
|
allMetrics = append(allMetrics, metrics...)
|
|
|
|
}
|
|
|
|
for _, cache := range s.Caches {
|
|
metrics = []bcacheMetric{
|
|
// metrics in /sys/fs/bcache/<uuid>/<cache>/
|
|
{
|
|
name: "io_errors",
|
|
desc: "Number of errors that have occurred, decayed by io_error_halflife.",
|
|
value: float64(cache.IOErrors),
|
|
metricType: prometheus.GaugeValue,
|
|
extraLabel: []string{"cache_device"},
|
|
extraLabelValue: cache.Name,
|
|
},
|
|
{
|
|
name: "metadata_written_bytes_total",
|
|
desc: "Sum of all non data writes (btree writes and all other metadata).",
|
|
value: float64(cache.MetadataWritten),
|
|
metricType: prometheus.CounterValue,
|
|
extraLabel: []string{"cache_device"},
|
|
extraLabelValue: cache.Name,
|
|
},
|
|
{
|
|
name: "written_bytes_total",
|
|
desc: "Sum of all data that has been written to the cache.",
|
|
value: float64(cache.Written),
|
|
metricType: prometheus.CounterValue,
|
|
extraLabel: []string{"cache_device"},
|
|
extraLabelValue: cache.Name,
|
|
},
|
|
}
|
|
if *priorityStats {
|
|
// metrics in /sys/fs/bcache/<uuid>/<cache>/priority_stats
|
|
priorityStatsMetrics := []bcacheMetric{
|
|
{
|
|
name: "priority_stats_unused_percent",
|
|
desc: "The percentage of the cache that doesn't contain any data.",
|
|
value: float64(cache.Priority.UnusedPercent),
|
|
metricType: prometheus.GaugeValue,
|
|
extraLabel: []string{"cache_device"},
|
|
extraLabelValue: cache.Name,
|
|
},
|
|
{
|
|
name: "priority_stats_metadata_percent",
|
|
desc: "Bcache's metadata overhead.",
|
|
value: float64(cache.Priority.MetadataPercent),
|
|
metricType: prometheus.GaugeValue,
|
|
extraLabel: []string{"cache_device"},
|
|
extraLabelValue: cache.Name,
|
|
},
|
|
}
|
|
metrics = append(metrics, priorityStatsMetrics...)
|
|
}
|
|
allMetrics = append(allMetrics, metrics...)
|
|
}
|
|
|
|
for _, m := range allMetrics {
|
|
labels := append(devLabel, m.extraLabel...)
|
|
|
|
desc := prometheus.NewDesc(
|
|
prometheus.BuildFQName(namespace, subsystem, m.name),
|
|
m.desc,
|
|
labels,
|
|
nil,
|
|
)
|
|
|
|
labelValues := []string{s.Name}
|
|
if m.extraLabelValue != "" {
|
|
labelValues = append(labelValues, m.extraLabelValue)
|
|
}
|
|
|
|
ch <- prometheus.MustNewConstMetric(
|
|
desc,
|
|
m.metricType,
|
|
m.value,
|
|
labelValues...,
|
|
)
|
|
}
|
|
}
|