1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/metrics/background_process_metrics.py b/synapse/metrics/background_process_metrics.py
index de96ca0821..4455fa71a8 100644
--- a/synapse/metrics/background_process_metrics.py
+++ b/synapse/metrics/background_process_metrics.py
@@ -93,7 +93,7 @@ _background_process_db_sched_duration = Counter(
# map from description to a counter, so that we can name our logcontexts
# incrementally. (It actually duplicates _background_process_start_count, but
# it's much simpler to do so than to try to combine them.)
-_background_process_counts = {} # type: Dict[str, int]
+_background_process_counts: Dict[str, int] = {}
# Set of all running background processes that became active active since the
# last time metrics were scraped (i.e. background processes that performed some
@@ -103,7 +103,7 @@ _background_process_counts = {} # type: Dict[str, int]
# background processes stacking up behind a lock or linearizer, where we then
# only need to iterate over and update metrics for the process that have
# actually been active and can ignore the idle ones.
-_background_processes_active_since_last_scrape = set() # type: Set[_BackgroundProcess]
+_background_processes_active_since_last_scrape: "Set[_BackgroundProcess]" = set()
# A lock that covers the above set and dict
_bg_metrics_lock = threading.Lock()
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