Merge pull request #159 from matrix-org/erikj/metrics_interface_config

Enable changing the interface the metrics listener binds to

synapse/app/homeserver.py

@@ -277,9 +277,12 @@ class SynapseHomeServer(HomeServer):
                     config,
                     metrics_resource,
                 ),
-                interface="127.0.0.1",
+                interface=config.metrics_bind_host,
+            )
+            logger.info(
+                "Metrics now running on %s port %d",
+                config.metrics_bind_host, config.metrics_port,
             )
-            logger.info("Metrics now running on 127.0.0.1 port %d", config.metrics_port)
 
     def run_startup_checks(self, db_conn, database_engine):
         all_users_native = are_all_users_on_domain(

synapse/config/metrics.py

@@ -20,6 +20,7 @@ class MetricsConfig(Config):
     def read_config(self, config):
         self.enable_metrics = config["enable_metrics"]
         self.metrics_port = config.get("metrics_port")
+        self.metrics_bind_host = config.get("metrics_bind_host", "127.0.0.1")
 
     def default_config(self, config_dir_path, server_name):
         return """\
@@ -28,6 +29,9 @@ class MetricsConfig(Config):
         # Enable collection and rendering of performance metrics
         enable_metrics: False
 
-        # Separate port to accept metrics requests on (on localhost)
+        # Separate port to accept metrics requests on
         # metrics_port: 8081
+
+        # Which host to bind the metric listener to
+        # metrics_bind_host: 127.0.0.1
         """