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lib/promscrape: export vm_promscrape_scrapers_{started|stopped}_total metrics for monitoring target churn rate

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This commit is contained in:
Aliaksandr Valialkin 2020-12-08 11:57:52 +02:00
parent affcee199c
commit 06091cfdf8
2 changed files with 12 additions and 4 deletions
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2
docs/CHANGELOG.md
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@ -6,6 +6,8 @@
Though [InfluxDB line protocol](https://docs.influxdata.com/influxdb/v1.8/write_protocols/line_protocol_tutorial/) denies multiple whitespace chars between these entities,
some apps improperly put multiple whitespace chars. This workaround allows accepting data from such apps.
* FEATURE: export `vm_promscrape_active_scrapers{type="<sd_type>"}` metric for tracking the number of active scrapers per each service discovery type.
* FEATURE: export `vm_promscrape_scrapers_started_total{type="<sd_type>"}` and `vm_promscrape_scrapers_stopped_total{type="<sd_type>"}` metrics for tracking churn rate for scrapers
per each service discovery type.
* BUGFIX: prevent from duplicate `name` tag returned from `/tags/autoComplete/tags` handler. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/942
* BUGFIX: do not enable strict parsing for `-promscrape.config` if `-promscrape.config.dryRun` comand-line flag is set. Strict parsing can be enabled with `-promscrape.config.strictParse` command-line flag. See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/944

14
lib/promscrape/scraper.go
View File

@ -250,8 +250,10 @@ type scraperGroup struct {
m map[string]*scraper
pushData func(wr *prompbmarshal.WriteRequest)
changesCount *metrics.Counter
activeScrapers *metrics.Counter
changesCount *metrics.Counter
activeScrapers *metrics.Counter
scrapersStarted *metrics.Counter
scrapersStopped *metrics.Counter
}
func newScraperGroup(name string, pushData func(wr *prompbmarshal.WriteRequest)) *scraperGroup {
@ -260,8 +262,10 @@ func newScraperGroup(name string, pushData func(wr *prompbmarshal.WriteRequest))
m: make(map[string]*scraper),
pushData: pushData,
changesCount: metrics.NewCounter(fmt.Sprintf(`vm_promscrape_config_changes_total{type=%q}`, name)),
activeScrapers: metrics.NewCounter(fmt.Sprintf(`vm_promscrape_active_scrapers{type=%q}`, name)),
changesCount: metrics.NewCounter(fmt.Sprintf(`vm_promscrape_config_changes_total{type=%q}`, name)),
activeScrapers: metrics.NewCounter(fmt.Sprintf(`vm_promscrape_active_scrapers{type=%q}`, name)),
scrapersStarted: metrics.NewCounter(fmt.Sprintf(`vm_promscrape_scrapers_started_total{type=%q}`, name)),
scrapersStopped: metrics.NewCounter(fmt.Sprintf(`vm_promscrape_scrapers_stopped_total{type=%q}`, name)),
}
metrics.NewGauge(fmt.Sprintf(`vm_promscrape_targets{type=%q, status="up"}`, name), func() float64 {
return float64(tsmGlobal.StatusByGroup(sg.name, true))
@ -313,12 +317,14 @@ func (sg *scraperGroup) update(sws []ScrapeWork) {
// Start a scraper for the missing key.
sc := newScraper(sw, sg.name, sg.pushData)
sg.activeScrapers.Inc()
sg.scrapersStarted.Inc()
sg.wg.Add(1)
go func() {
defer sg.wg.Done()
sc.sw.run(sc.stopCh)
tsmGlobal.Unregister(sw)
sg.activeScrapers.Dec()
sg.scrapersStopped.Inc()
}()
tsmGlobal.Register(sw)
sg.m[key] = sc