fix(signal): log exception instead of warning for bad signal id (#5692)

src/dispatch/signal/service.py

@@ -574,7 +574,7 @@ def create_instance(
     # remove non-serializable entities from the raw JSON:
     signal_instance_in_raw = signal_instance_in.raw.copy()
     if signal_instance_in.oncall_service:
-        signal_instance_in_raw.pop('oncall_service')
+        signal_instance_in_raw.pop("oncall_service")
 
     # we round trip the raw data to json-ify date strings
     signal_instance = SignalInstance(
@@ -603,7 +603,7 @@ def create_instance(
 
     if signal_instance.id and not is_valid_uuid(signal_instance.id):
         msg = f"Invalid signal id format. Expecting UUIDv4 format. Signal id: {signal_instance.id}. Signal name/variant: {signal_instance.raw['name'] if signal_instance and signal_instance.raw and signal_instance.raw.get('name') else signal_instance.raw['variant']}"
-        log.warn(msg)
+        log.exception(msg)
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
             detail=[{"msg": msg}],