feat: expose websocket delivery pressure metrics

server/monitoring_http_test.go

@@ -91,6 +91,10 @@ func TestServeMetricsIncludesWSConnections(t *testing.T) {
 	immetrics.KafkaConsumerLag.WithLabelValues("test", "topic", "group").Set(0)
 	immetrics.KafkaDeadLettersTotal.WithLabelValues("p2p", "test").Add(0)
 	immetrics.ObserveInternalQueueEnqueue("test", 0, 1, true)
+	immetrics.ObserveWSWrite("text", "ok", "none", time.Now(), 10)
+	immetrics.IncWSDisconnect("close_normal")
+	immetrics.ObserveWSSendQueueEnqueue(1, 160, true)
+	immetrics.ObserveWSSendQueueDequeue(time.Now(), false)
 	wrt := httptest.NewRecorder()
 	serveMetrics(wrt, httptest.NewRequest(http.MethodGet, "/metrics", nil))
 
@@ -102,6 +106,9 @@ func TestServeMetricsIncludesWSConnections(t *testing.T) {
 		t.Fatalf("unexpected body %s", body)
 	}
 	for _, metric := range []string{"im_ws_connections_active", "im_cluster_p2m_queue_length",
+		"im_ws_write_total", "im_ws_write_duration_seconds", "im_ws_write_bytes_total",
+		"im_ws_disconnect_total", "im_ws_send_queue_current", "im_ws_send_queue_capacity",
+		"im_ws_send_queue_enqueue_total", "im_ws_send_queue_depth", "im_ws_send_queue_wait_duration_seconds",
 		"im_cluster_p2m_enqueue_total", "im_cluster_rpc_duration_seconds", "im_cluster_route_total",
 		"im_internal_queue_enqueue_total", "im_internal_queue_depth", "im_internal_queue_capacity",
 		"im_kafka_message_persist_total", "im_kafka_consumer_lag", "im_kafka_dead_letters_total"} {