Trace discovery API requests and enrich request logs

Co-Authored-By: Claude <noreply@anthropic.com>

internal/discovery/server.go

@@ -20,6 +20,7 @@ import (
 	logf "sigs.k8s.io/controller-runtime/pkg/log"
 
 	"gitea.home.hrajfrisbee.cz/kacerr/egress-proxies-operator/internal/lease"
+	"gitea.home.hrajfrisbee.cz/kacerr/egress-proxies-operator/internal/tracing"
 )
 
 // LeaseStore is what the handlers need from a lease backend. Defined here,
@@ -136,7 +137,9 @@ func (s *Server) Start(ctx context.Context) error {
 }
 
 // handler assembles the mux and the middleware chain, outermost first:
-// recover → request-log → body-size cap → bearer auth.
+// recover → tracing (server span + request logger) → request-log →
+// body-size cap → bearer auth. Everything inside the tracing layer logs via
+// logf.FromContext(r.Context()) and so carries traceID/spanID.
 func (s *Server) handler() http.Handler {
 	mux := http.NewServeMux()
 	mux.HandleFunc("GET /healthz", func(w http.ResponseWriter, _ *http.Request) {
@@ -152,6 +155,7 @@ func (s *Server) handler() http.Handler {
 	h = s.authMiddleware(h)
 	h = maxBytesMiddleware(h)
 	h = s.logMiddleware(h)
+	h = tracing.HTTPMiddleware("discovery", s.log)(h)
 	h = s.recoverMiddleware(h)
 	return h
 }
@@ -188,7 +192,7 @@ func (s *Server) logMiddleware(next http.Handler) http.Handler {
 		rec := &statusRecorder{ResponseWriter: w, status: http.StatusOK}
 		start := time.Now()
 		next.ServeHTTP(rec, r)
-		s.log.Info("request",
+		logf.FromContext(r.Context()).Info("request",
 			"method", r.Method, "path", r.URL.Path,
 			"status", rec.status, "duration", time.Since(start).String())
 	})