feat: add request type to httptrace and request duration metrics

Signed-off-by: Clément Nussbaumer <clement.nussbaumer@postfinance.ch>

internal/servicecheck/httptrace.go

@@ -1,6 +1,7 @@
 package servicecheck
 
 import (
+	"context"
 	"crypto/tls"
 	"log"
 	"net/http"
@@ -30,8 +31,7 @@ func withHttptrace(registry *prometheus.Registry, next http.RoundTripper, durati
 			Name:      "httpclient_requests_total",
 			Help:      "A counter for requests from the kubenurse http client.",
 		},
-		// []string{"code", "method", "type"}, // TODO
-		[]string{"code", "method"},
+		[]string{"code", "method", "type"},
 	)
 
 	httpclientReqDuration := prometheus.NewHistogramVec(
@@ -41,8 +41,7 @@ func withHttptrace(registry *prometheus.Registry, next http.RoundTripper, durati
 			Help:      "A latency histogram of request latencies from the kubenurse http client.",
 			Buckets:   durationHistogram,
 		},
-		// []string{"type"}, // TODO
-		[]string{},
+		[]string{"type"},
 	)
 
 	httpclientTraceReqDuration := prometheus.NewHistogramVec(
@@ -52,8 +51,7 @@ func withHttptrace(registry *prometheus.Registry, next http.RoundTripper, durati
 			Help:      "Latency histogram for requests from the kubenurse http client. Time in seconds since the start of the http request.",
 			Buckets:   durationHistogram,
 		},
-		[]string{"event"},
-		// []string{"event", "type"}, // TODO
+		[]string{"event", "type"},
 	)
 
 	registry.MustRegister(httpclientReqTotal, httpclientReqDuration, httpclientTraceReqDuration)
@@ -68,7 +66,7 @@ func withHttptrace(registry *prometheus.Registry, next http.RoundTripper, durati
 			return
 		}
 
-		httpclientTraceReqDuration.WithLabelValues(traceEventType).Observe(td) // TODO: add back kubenurseTypeKey
+		httpclientTraceReqDuration.WithLabelValues(traceEventType, kubenurseTypeLabel).Observe(td)
 	}
 
 	// Return a http.RoundTripper for tracing requests
@@ -110,14 +108,13 @@ func withHttptrace(registry *prometheus.Registry, next http.RoundTripper, durati
 		// Do request with tracing enabled
 		r = r.WithContext(httptrace.WithClientTrace(r.Context(), trace))
 
-		// // TODO: uncomment when issue #55 is solved (N^2 request will increase cardinality of path_ metrics too much otherwise)
-		// typeFromCtxFn := promhttp.WithLabelFromCtx("type", func(ctx context.Context) string {
-		// 	return ctx.Value(kubenurseTypeKey{}).(string)
-		// })
+		typeFromCtxFn := promhttp.WithLabelFromCtx("type", func(ctx context.Context) string {
+			return ctx.Value(kubenurseTypeKey{}).(string)
+		})
 
 		rt := next // variable pinning :) essential, to prevent always re-instrumenting the original variable
-		rt = promhttp.InstrumentRoundTripperCounter(httpclientReqTotal, rt)
-		rt = promhttp.InstrumentRoundTripperDuration(httpclientReqDuration, rt)
+		rt = promhttp.InstrumentRoundTripperCounter(httpclientReqTotal, rt, typeFromCtxFn)
+		rt = promhttp.InstrumentRoundTripperDuration(httpclientReqDuration, rt, typeFromCtxFn)
 
 		return rt.RoundTrip(r)
 	})

internal/servicecheck/servicecheck.go

@@ -114,7 +114,7 @@ func (c *Checker) Run() (Result, bool) {
 	if c.SkipCheckNeighbourhood {
 		res.NeighbourhoodState = skippedStr
 	} else {
-		res.Neighbourhood, err = c.GetNeighbours(context.TODO(), c.KubenurseNamespace, c.NeighbourFilter)
+		res.Neighbourhood, err = c.GetNeighbours(context.Background(), c.KubenurseNamespace, c.NeighbourFilter)
 		haserr = haserr || (err != nil)
 
 		// Neighbourhood special error treating