1 files changed, 4 insertions, 2 deletions
diff --git a/synapse/metrics/background_process_metrics.py b/synapse/metrics/background_process_metrics.py
index 7a1516d3a8..9ea4e23b31 100644
--- a/synapse/metrics/background_process_metrics.py
+++ b/synapse/metrics/background_process_metrics.py
@@ -174,8 +174,10 @@ class _BackgroundProcess:
diff = new_stats - self._reported_stats
self._reported_stats = new_stats
- _background_process_ru_utime.labels(self.desc).inc(diff.ru_utime)
- _background_process_ru_stime.labels(self.desc).inc(diff.ru_stime)
+ # For unknown reasons, the difference in times can be negative. See comment in
+ # synapse.http.request_metrics.RequestMetrics.update_metrics.
+ _background_process_ru_utime.labels(self.desc).inc(max(diff.ru_utime, 0))
+ _background_process_ru_stime.labels(self.desc).inc(max(diff.ru_stime, 0))
_background_process_db_txn_count.labels(self.desc).inc(diff.db_txn_count)
_background_process_db_txn_duration.labels(self.desc).inc(
diff.db_txn_duration_sec
|
