commented on the section with CORS

src/metrics.gateway.ts

@@ -4,11 +4,12 @@ import { PrometheusService } from './prometheus.service';
 import { Logger } from '@nestjs/common';
 
 @WebSocketGateway({
-    cors: {
-        origin: '*', // В production укажите конкретные домены
-        methods: ['GET', 'POST'],
-        credentials: true
-    },
+    /* 
+     cors: {
+         origin: '*', // В production укажите конкретные домены
+         methods: ['GET', 'POST'],
+         credentials: true
+     }, */
     namespace: '/api/metrics-ws'
 })
 export class MetricsGateway implements OnGatewayInit, OnGatewayConnection, OnGatewayDisconnect {