Merge pull request #6510 from matrix-org/erikj/phone_home_stats_db

Phone home stats DB reporting should not assume a single DB.

changelog.d/6510.misc

+Change phone home stats to not assume there is a single database and report information about the database used by the main data store.

synapse/app/homeserver.py

@@ -519,8 +519,10 @@ def phone_stats_home(hs, stats, stats_process=_stats_process):
     # Database version
     #
 
-    stats["database_engine"] = hs.database_engine.module.__name__
-    stats["database_server_version"] = hs.database_engine.server_version
+    # This only reports info about the *main* database.
+    stats["database_engine"] = hs.get_datastore().db.engine.module.__name__
+    stats["database_server_version"] = hs.get_datastore().db.engine.server_version
+
     logger.info("Reporting stats to %s: %s" % (hs.config.report_stats_endpoint, stats))
     try:
         yield hs.get_proxied_http_client().put_json(