synapse: Enable development metrics

deploy/dev/synapse-homeserver.yaml

@@ -302,11 +302,15 @@ listeners:
     tls: false
     type: http
     x_forwarded: true
-
     resources:
       - names: [client, federation]
         compress: false
 
+  - port: 9000
+    type: metrics
+    bind_addresses:
+      - '0.0.0.0'
+
     # example additional_resources:
     #
     #additional_resources:
@@ -1509,7 +1513,7 @@ account_threepid_delegates:
 
 # Enable collection and rendering of performance metrics
 #
-#enable_metrics: false
+enable_metrics: true
 
 # Enable sentry integration
 # NOTE: While attempts are made to ensure that the logs don't contain