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lib/promscrape/discovery/kubernetes: add vm_promscrape_discovery_kubernetes_* metrics for monitoring internal state of k8s service discovery

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This commit is contained in:
Aliaksandr Valialkin 2021-02-28 16:57:40 +02:00
parent f52bdbe2a3
commit 0ef7a94056
1 changed files with 32 additions and 0 deletions
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32
lib/promscrape/discovery/kubernetes/api.go
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@ -20,6 +20,7 @@ import (
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promauth"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promscrape/discoveryutils"
"github.com/VictoriaMetrics/metrics"
)
var apiServerTimeout = flag.Duration("promscrape.kubernetes.apiServerTimeout", 10*time.Minute, "How frequently to reload the full state from Kuberntes API server")
@ -226,12 +227,16 @@ func (aw *apiWatcher) startWatcherForURL(role, apiURL string, parseObject parseO
aw.watchersByURL[apiURL] = uw
aw.mu.Unlock()
uw.watchersCount.Inc()
uw.watchersCreated.Inc()
resourceVersion := uw.reloadObjects()
go func() {
uw.watchForUpdates(resourceVersion)
aw.mu.Lock()
delete(aw.watchersByURL, apiURL)
aw.mu.Unlock()
uw.watchersCount.Dec()
uw.watchersStopped.Inc()
}()
}
@ -271,6 +276,14 @@ type urlWatcher struct {
// the parent apiWatcher
aw *apiWatcher
watchersCount *metrics.Counter
watchersCreated *metrics.Counter
watchersStopped *metrics.Counter
objectsCount *metrics.Counter
objectsAdded *metrics.Counter
objectsRemoved *metrics.Counter
}
func (aw *apiWatcher) newURLWatcher(role, apiURL string, parseObject parseObjectFunc, parseObjectList parseObjectListFunc) *urlWatcher {
@ -285,6 +298,14 @@ func (aw *apiWatcher) newURLWatcher(role, apiURL string, parseObject parseObject
labelsByKey: make(map[string][]map[string]string),
aw: aw,
watchersCount: metrics.GetOrCreateCounter(fmt.Sprintf(`vm_promscrape_discovery_kubernetes_url_watchers{role=%q}`, role)),
watchersCreated: metrics.GetOrCreateCounter(fmt.Sprintf(`vm_promscrape_discovery_kubernetes_url_watchers_created_total{role=%q}`, role)),
watchersStopped: metrics.GetOrCreateCounter(fmt.Sprintf(`vm_promscrape_discovery_kubernetes_url_watchers_stopped_total{role=%q}`, role)),
objectsCount: metrics.GetOrCreateCounter(fmt.Sprintf(`vm_promscrape_discovery_kubernetes_objects{role=%q}`, role)),
objectsAdded: metrics.GetOrCreateCounter(fmt.Sprintf(`vm_promscrape_discovery_kubernetes_objects_added_total{role=%q}`, role)),
objectsRemoved: metrics.GetOrCreateCounter(fmt.Sprintf(`vm_promscrape_discovery_kubernetes_objects_removed_total{role=%q}`, role)),
}
}
@ -312,6 +333,9 @@ func (uw *urlWatcher) reloadObjects() string {
labelsByKey[k] = o.getTargetLabels(uw.aw)
}
uw.mu.Lock()
uw.objectsRemoved.Add(-len(uw.objectsByKey))
uw.objectsAdded.Add(len(objectsByKey))
uw.objectsCount.Add(len(objectsByKey) - len(uw.objectsByKey))
uw.objectsByKey = objectsByKey
uw.labelsByKey = labelsByKey
uw.mu.Unlock()
@ -399,6 +423,10 @@ func (uw *urlWatcher) readObjectUpdateStream(r io.Reader) error {
switch we.Type {
case "ADDED", "MODIFIED":
uw.mu.Lock()
if uw.objectsByKey[key] == nil {
uw.objectsAdded.Inc()
uw.objectsCount.Inc()
}
uw.objectsByKey[key] = o
uw.mu.Unlock()
labels := o.getTargetLabels(uw.aw)
@ -407,6 +435,10 @@ func (uw *urlWatcher) readObjectUpdateStream(r io.Reader) error {
uw.mu.Unlock()
case "DELETED":
uw.mu.Lock()
if uw.objectsByKey[key] != nil {
uw.objectsRemoved.Inc()
uw.objectsCount.Dec()
}
delete(uw.objectsByKey, key)
delete(uw.labelsByKey, key)
uw.mu.Unlock()