diff options
| -rw-r--r-- | changelog.d/3996.bugfix | 1 | ||||
| -rw-r--r-- | synapse/metrics/background_process_metrics.py | 8 |
2 files changed, 7 insertions, 2 deletions
diff --git a/changelog.d/3996.bugfix b/changelog.d/3996.bugfix new file mode 100644 index 0000000000..a056485ea1 --- /dev/null +++ b/changelog.d/3996.bugfix @@ -0,0 +1 @@ +Fix exception in background metrics collection diff --git a/synapse/metrics/background_process_metrics.py b/synapse/metrics/background_process_metrics.py index 173908299c..037f1c490e 100644 --- a/synapse/metrics/background_process_metrics.py +++ b/synapse/metrics/background_process_metrics.py @@ -101,9 +101,13 @@ class _Collector(object): labels=["name"], ) - # We copy the dict so that it doesn't change from underneath us + # We copy the dict so that it doesn't change from underneath us. + # We also copy the process lists as that can also change with _bg_metrics_lock: - _background_processes_copy = dict(_background_processes) + _background_processes_copy = { + k: list(v) + for k, v in six.iteritems(_background_processes) + } for desc, processes in six.iteritems(_background_processes_copy): background_process_in_flight_count.add_metric( |