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-rw-r--r--synapse/handlers/room.py8
-rw-r--r--synapse/http/request_metrics.py10
2 files changed, 13 insertions, 5 deletions
diff --git a/synapse/handlers/room.py b/synapse/handlers/room.py
index 2abd63ad05..ab72963d87 100644
--- a/synapse/handlers/room.py
+++ b/synapse/handlers/room.py
@@ -23,7 +23,7 @@ from synapse.types import UserID, RoomAlias, RoomID, RoomStreamToken
 from synapse.api.constants import (
     EventTypes, JoinRules, RoomCreationPreset
 )
-from synapse.api.errors import AuthError, StoreError, SynapseError
+from synapse.api.errors import AuthError, Codes, StoreError, SynapseError
 from synapse.util import stringutils
 from synapse.visibility import filter_events_for_client
 
@@ -115,7 +115,11 @@ class RoomCreationHandler(BaseHandler):
             )
 
             if mapping:
-                raise SynapseError(400, "Room alias already taken")
+                raise SynapseError(
+                    400,
+                    "Room alias already taken",
+                    Codes.ROOM_IN_USE
+                )
         else:
             room_alias = None
 
diff --git a/synapse/http/request_metrics.py b/synapse/http/request_metrics.py
index dc06f6c443..1b711ca2de 100644
--- a/synapse/http/request_metrics.py
+++ b/synapse/http/request_metrics.py
@@ -117,13 +117,17 @@ def _get_in_flight_counts():
     Returns:
         dict[tuple[str, str], int]
     """
-    for rm in _in_flight_requests:
+    # Cast to a list to prevent it changing while the Prometheus
+    # thread is collecting metrics
+    reqs = list(_in_flight_requests)
+
+    for rm in reqs:
         rm.update_metrics()
 
     # Map from (method, name) -> int, the number of in flight requests of that
     # type
     counts = {}
-    for rm in _in_flight_requests:
+    for rm in reqs:
         key = (rm.method, rm.name,)
         counts[key] = counts.get(key, 0) + 1
 
@@ -131,7 +135,7 @@ def _get_in_flight_counts():
 
 
 LaterGauge(
-    "synapse_http_request_metrics_in_flight_requests_count",
+    "synapse_http_server_in_flight_requests_count",
     "",
     ["method", "servlet"],
     _get_in_flight_counts,