Move prometheus setup to mautrix-python

mautrix_telegram/__main__.py

@@ -78,13 +78,6 @@ class TelegramBridge(Bridge):
                                    provisioning_api.app)
             context.provisioning_api = provisioning_api
 
-        if self.config["metrics.enabled"]:
-            if prometheus:
-                prometheus.start_http_server(self.config["metrics.listen_port"])
-            else:
-                self.log.warning("Metrics are enabled in the config, "
-                                 "but prometheus_client is not installed.")
-
     def prepare_bridge(self) -> None:
         self.bot = init_bot(self.config)
         context = Context(self.az, self.config, self.loop, self.session_container, self, self.bot)