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-rw-r--r--synapse/http/server.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/http/server.py b/synapse/http/server.py
index 2c131a7017..29241fa145 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -214,6 +214,10 @@ class JsonResource(HttpServer, resource.Resource):
         self._async_render(request)
         return server.NOT_DONE_YET
 
+    # Disable metric reporting because _async_render does its own metrics.
+    # It does its own metric reporting because _async_render dispatches to
+    # a callback and it's the class name of that callback we want to report
+    # against rather than the JsonResource itself.
     @request_handler(report_metrics=False)
     @defer.inlineCallbacks
     def _async_render(self, request):