apiserver: add key/value pair to httplog

staging/src/k8s.io/apiserver/pkg/endpoints/filterlatency/filterlatency.go

@@ -18,6 +18,7 @@ package filterlatency
 
 import (
 	"context"
+	"fmt"
 	"net/http"
 	"time"
 
@@ -64,7 +65,7 @@ func TrackCompleted(handler http.Handler) http.Handler {
 		latency := completedAt.Sub(fr.startedTimestamp)
 		metrics.RecordFilterLatency(ctx, fr.name, latency)
 		if klog.V(3).Enabled() && latency > minFilterLatencyToLog {
-			httplog.AddInfof(ctx, "%s=%s", fr.name, latency.String())
+			httplog.AddKeyValue(ctx, fmt.Sprintf("fl_%s", fr.name), latency.String())
 		}
 	})
 }

staging/src/k8s.io/apiserver/pkg/server/httplog/httplog.go

@@ -55,6 +55,7 @@ type respLogger struct {
 	status             int
 	statusStack        string
 	addedInfo          strings.Builder
+	addedKeyValuePairs []interface{}
 	startTime          time.Time
 
 	captureErrorOutput bool
@@ -181,6 +182,20 @@ func AddInfof(ctx context.Context, format string, data ...interface{}) {
 	}
 }
 
+func (rl *respLogger) AddKeyValue(key string, value interface{}) {
+	rl.addedKeyValuePairs = append(rl.addedKeyValuePairs, key, value)
+}
+
+// AddKeyValue adds a (key, value) pair to the httplog associated
+// with the request.
+// Use this function if you want your data to show up in httplog
+// in a more structured and readable way.
+func AddKeyValue(ctx context.Context, key string, value interface{}) {
+	if rl := respLoggerFromContext(ctx); rl != nil {
+		rl.AddKeyValue(key, value)
+	}
+}
+
 // Log is intended to be called once at the end of your request handler, via defer
 func (rl *respLogger) Log() {
 	latency := time.Since(rl.startTime)
@@ -204,6 +219,7 @@ func (rl *respLogger) Log() {
 		"audit-ID", auditID,
 		"srcIP", rl.req.RemoteAddr,
 	}
+	keysAndValues = append(keysAndValues, rl.addedKeyValuePairs...)
 
 	if rl.hijacked {
 		keysAndValues = append(keysAndValues, "hijacked", true)