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Track number of registered watchers in apiserver
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commit
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@ -30,6 +30,7 @@ import (
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
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"k8s.io/apiserver/pkg/endpoints/metrics"
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"k8s.io/apiserver/pkg/endpoints/request"
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"k8s.io/apiserver/pkg/server/httplog"
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"k8s.io/apiserver/pkg/util/wsstream"
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@ -140,6 +141,10 @@ type WatchServer struct {
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// ServeHTTP serves a series of encoded events via HTTP with Transfer-Encoding: chunked
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// or over a websocket connection.
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func (s *WatchServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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kind := s.Scope.Kind
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metrics.RegisteredWatchers.WithLabelValues(kind.Group, kind.Version, kind.Kind).Inc()
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defer metrics.RegisteredWatchers.WithLabelValues(kind.Group, kind.Version, kind.Kind).Dec()
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w = httplog.Unlogged(w)
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if wsstream.IsWebSocketRequest(req) {
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@ -93,6 +93,14 @@ var (
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},
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[]string{"requestKind"},
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)
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// RegisteredWatchers is a number of currently registered watchers splitted by resource.
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RegisteredWatchers = prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Name: "apiserver_registered_watchers",
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Help: "Number of currently registered watchers for a given resources",
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},
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[]string{"group", "version", "kind"},
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)
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// Because of volatality of the base metric this is pre-aggregated one. Instead of reporing current usage all the time
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// it reports maximal usage during the last second.
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currentInflightRequests = prometheus.NewGaugeVec(
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@ -111,6 +119,7 @@ var (
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requestLatenciesSummary,
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responseSizes,
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DroppedRequests,
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RegisteredWatchers,
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currentInflightRequests,
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}
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)
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