mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-22 08:26:19 +01:00
105 lines
2.9 KiB
Go
105 lines
2.9 KiB
Go
package main
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import (
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"flag"
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"sync"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmstorage"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/appmetrics"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompb"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/protoparser/prometheus"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/storage"
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)
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var (
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selfScrapeInterval = flag.Duration("selfScrapeInterval", 0, "Interval for self-scraping own metrics at /metrics page")
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selfScrapeInstance = flag.String("selfScrapeInstance", "self", "Value for 'instance' label, which is added to self-scraped metrics")
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selfScrapeJob = flag.String("selfScrapeJob", "victoria-metrics", "Value for 'job' label, which is added to self-scraped metrics")
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)
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var selfScraperStopCh chan struct{}
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var selfScraperWG sync.WaitGroup
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func startSelfScraper() {
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selfScraperStopCh = make(chan struct{})
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selfScraperWG.Add(1)
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go func() {
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defer selfScraperWG.Done()
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selfScraper(*selfScrapeInterval)
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}()
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}
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func stopSelfScraper() {
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close(selfScraperStopCh)
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selfScraperWG.Wait()
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}
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func selfScraper(scrapeInterval time.Duration) {
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if scrapeInterval <= 0 {
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// Self-scrape is disabled.
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return
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}
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logger.Infof("started self-scraping `/metrics` page with interval %.3f seconds", scrapeInterval.Seconds())
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var bb bytesutil.ByteBuffer
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var rows prometheus.Rows
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var mrs []storage.MetricRow
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var labels []prompb.Label
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t := time.NewTicker(scrapeInterval)
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var currentTimestamp int64
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for {
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select {
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case <-selfScraperStopCh:
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t.Stop()
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logger.Infof("stopped self-scraping `/metrics` page")
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return
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case currentTime := <-t.C:
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currentTimestamp = currentTime.UnixNano() / 1e6
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}
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bb.Reset()
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appmetrics.WritePrometheusMetrics(&bb)
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s := bytesutil.ToUnsafeString(bb.B)
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rows.Reset()
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rows.Unmarshal(s)
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mrs = mrs[:0]
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for i := range rows.Rows {
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r := &rows.Rows[i]
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labels = labels[:0]
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labels = addLabel(labels, "", r.Metric)
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labels = addLabel(labels, "job", *selfScrapeJob)
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labels = addLabel(labels, "instance", *selfScrapeInstance)
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for j := range r.Tags {
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t := &r.Tags[j]
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labels = addLabel(labels, t.Key, t.Value)
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}
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if len(mrs) < cap(mrs) {
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mrs = mrs[:len(mrs)+1]
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} else {
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mrs = append(mrs, storage.MetricRow{})
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}
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mr := &mrs[len(mrs)-1]
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mr.MetricNameRaw = storage.MarshalMetricNameRaw(mr.MetricNameRaw[:0], labels)
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mr.Timestamp = currentTimestamp
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mr.Value = r.Value
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}
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if err := vmstorage.AddRows(mrs); err != nil {
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logger.Errorf("cannot store self-scraped metrics: %s", err)
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}
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}
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}
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func addLabel(dst []prompb.Label, key, value string) []prompb.Label {
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if len(dst) < cap(dst) {
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dst = dst[:len(dst)+1]
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} else {
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dst = append(dst, prompb.Label{})
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}
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lb := &dst[len(dst)-1]
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lb.Name = key
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lb.Value = value
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return dst
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}
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