[server, bridge] Bind metrics apps to "127.0.0.1" instead of "localhost" (#20719)

Tool: gitpod/catfood.gitpod.cloud

Author: geropl

components/server/src/server.ts

@@ -365,7 +365,7 @@ export class Server {
         this.httpServer = httpServer;
 
         if (this.monitoringApp) {
-            this.monitoringHttpServer = this.monitoringApp.listen(MONITORING_PORT, "localhost", () => {
+            this.monitoringHttpServer = this.monitoringApp.listen(MONITORING_PORT, "127.0.0.1", () => {
                 log.info(
                     `monitoring app listening on port: ${(<AddressInfo>this.monitoringHttpServer!.address()).port}`,
                 );

components/ws-manager-bridge/src/main.ts

@@ -48,8 +48,8 @@ export const start = async (container: Container) => {
             res.send(await mergedRegistry.metrics());
         });
         const metricsPort = 9500;
-        const metricsHttpServer = metricsApp.listen(metricsPort, "localhost", () => {
-            log.info(`prometheus metrics server running on: localhost:${metricsPort}`);
+        const metricsHttpServer = metricsApp.listen(metricsPort, "127.0.0.1", () => {
+            log.info(`prometheus metrics server running on: 127.0.0.1:${metricsPort}`);
         });
 
         const debugApp = container.get<DebugApp>(DebugApp);