Quick & dirty metric for background update status (#15740)

* Quick & dirty metric for background update status

* Changelog

* Remove debug

Co-authored-by: Mathieu Velten <mathieuv@matrix.org>

* Actually write to _aborted

---------

Co-authored-by: Mathieu Velten <mathieuv@matrix.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/synapse/storage/database.py b/synapse/storage/database.py

index bdaa508dbe..10fa6c4802 100644
--- a/synapse/storage/database.py
+++ b/synapse/storage/database.py
@@ -54,7 +54,7 @@ from synapse.logging.context import (
     current_context,
     make_deferred_yieldable,
 )
-from synapse.metrics import register_threadpool
+from synapse.metrics import LaterGauge, register_threadpool
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.storage.background_updates import BackgroundUpdater
 from synapse.storage.engines import BaseDatabaseEngine, PostgresEngine, Sqlite3Engine
@@ -547,6 +547,12 @@ class DatabasePool:
         self._db_pool = make_pool(hs.get_reactor(), database_config, engine)
 
         self.updates = BackgroundUpdater(hs, self)
+        LaterGauge(
+            "synapse_background_update_status",
+            "Background update status",
+            [],
+            self.updates.get_status,
+        )
 
         self._previous_txn_total_time = 0.0
         self._current_txn_total_time = 0.0