add metrics to controller-manager

Signed-off-by: LiHui <andrewli@yunify.com>

pkg/apiserver/metric.go

@@ -0,0 +1,42 @@
+package apiserver
+
+import (
+	compbasemetrics "k8s.io/component-base/metrics"
+	"kubesphere.io/kubesphere/pkg/utils/metrics"
+)
+
+var (
+	RequestCounter = compbasemetrics.NewCounterVec(
+		&compbasemetrics.CounterOpts{
+			Name:           "ks_server_request_total",
+			Help:           "Counter of ks_server requests broken out for each verb, group, version, resource and HTTP response code.",
+			StabilityLevel: compbasemetrics.ALPHA,
+		},
+		[]string{"verb", "group", "version", "resource", "code"},
+	)
+
+	RequestLatencies = compbasemetrics.NewHistogramVec(
+		&compbasemetrics.HistogramOpts{
+			Name: "ks_server_request_duration_seconds",
+			Help: "Response latency distribution in seconds for each verb, group, version, resource",
+			// This metric is used for verifying api call latencies SLO,
+			// as well as tracking regressions in this aspects.
+			// Thus we customize buckets significantly, to empower both usecases.
+			Buckets: []float64{0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0,
+				1.25, 1.5, 1.75, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 40, 50, 60},
+			StabilityLevel: compbasemetrics.ALPHA,
+		},
+		[]string{"verb", "group", "version", "resource"},
+	)
+
+	metricsList = []compbasemetrics.Registerable{
+		RequestCounter,
+		RequestLatencies,
+	}
+)
+
+func register() {
+	for _, m := range metricsList {
+		metrics.MustRegister(m)
+	}
+}