Add a readyz probe to the benchmark glutton actor

benchmarking/workloads/manifests/workloads.yaml.tmpl

@@ -70,6 +70,11 @@ spec:
     - "--metrics-listen-addr=:9090"
     - "--data-dir=/tmp/glutton"
     - "--mode=http"
+    # Hold ResumeActor open until port 80 actually answers.
+    readyz:
+      httpGet:
+        path: /readyz
+        port: 80
   workerSelector:
     matchLabels:
       workload: benchmark-ateom

cmd/benchmarking/glutton/main.go

@@ -136,6 +136,11 @@ func main() {
 		// (re-exposable as additional routes if/when needed).
 		mux := http.NewServeMux()
 		mux.HandleFunc("/ping", httpPingHandler(svc))
+		// ateom blocks RestoreWorkload until this returns 200, so ResumeActor
+		// cannot report success before /ping is reachable.
+		mux.HandleFunc("/readyz", func(w http.ResponseWriter, r *http.Request) {
+			w.WriteHeader(http.StatusOK)
+		})
 		// otelhttp at the mux level + per-handler span follows
 		// docs/dev/best-practices/tracing.md: extract incoming context,
 		// then name the span after the operation in each handler.