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Merge pull request #63779 from wojtek-t/number_of_watchers_metrics

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Automatic merge from submit-queue (batch tested with PRs 63792, 63495, 63742, 63332, 63779). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Track a metrics of number of registered watchers in apiserver
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Kubernetes Submit Queue 2018-05-15 09:04:32 -07:00 committed by GitHub
commit bd0d093701
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2 changed files with 14 additions and 0 deletions
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5
staging/src/k8s.io/apiserver/pkg/endpoints/handlers/watch.go
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@ -30,6 +30,7 @@ import (
utilruntime "k8s.io/apimachinery/pkg/util/runtime" utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/watch" "k8s.io/apimachinery/pkg/watch"
"k8s.io/apiserver/pkg/endpoints/handlers/negotiation" "k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
"k8s.io/apiserver/pkg/endpoints/metrics"
"k8s.io/apiserver/pkg/endpoints/request" "k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/apiserver/pkg/server/httplog" "k8s.io/apiserver/pkg/server/httplog"
"k8s.io/apiserver/pkg/util/wsstream" "k8s.io/apiserver/pkg/util/wsstream"
@ -140,6 +141,10 @@ type WatchServer struct {
// ServeHTTP serves a series of encoded events via HTTP with Transfer-Encoding: chunked // ServeHTTP serves a series of encoded events via HTTP with Transfer-Encoding: chunked
// or over a websocket connection. // or over a websocket connection.
func (s *WatchServer) ServeHTTP(w http.ResponseWriter, req *http.Request) { func (s *WatchServer) ServeHTTP(w http.ResponseWriter, req *http.Request) {
kind := s.Scope.Kind
metrics.RegisteredWatchers.WithLabelValues(kind.Group, kind.Version, kind.Kind).Inc()
defer metrics.RegisteredWatchers.WithLabelValues(kind.Group, kind.Version, kind.Kind).Dec()
w = httplog.Unlogged(w) w = httplog.Unlogged(w)
if wsstream.IsWebSocketRequest(req) { if wsstream.IsWebSocketRequest(req) {

9
staging/src/k8s.io/apiserver/pkg/endpoints/metrics/metrics.go
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@ -93,6 +93,14 @@ var (
}, },
[]string{"requestKind"}, []string{"requestKind"},
) )
// RegisteredWatchers is a number of currently registered watchers splitted by resource.
RegisteredWatchers = prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Name: "apiserver_registered_watchers",
Help: "Number of currently registered watchers for a given resources",
},
[]string{"group", "version", "kind"},
)
// Because of volatality of the base metric this is pre-aggregated one. Instead of reporing current usage all the time // Because of volatality of the base metric this is pre-aggregated one. Instead of reporing current usage all the time
// it reports maximal usage during the last second. // it reports maximal usage during the last second.
currentInflightRequests = prometheus.NewGaugeVec( currentInflightRequests = prometheus.NewGaugeVec(
@ -111,6 +119,7 @@ var (
requestLatenciesSummary, requestLatenciesSummary,
responseSizes, responseSizes,
DroppedRequests, DroppedRequests,
RegisteredWatchers,
currentInflightRequests, currentInflightRequests,
} }
) )