Add more logging around message retention policies support (#6717)

So we can debug issues like #6683 more easily

changelog.d/6717.misc

@@ -0,0 +1 @@
+Add more logging around message retention policies support.

synapse/config/server.py

@@ -294,6 +294,14 @@ class ServerConfig(Config):
             self.retention_default_min_lifetime = None
             self.retention_default_max_lifetime = None
 
+        if self.retention_enabled:
+            logger.info(
+                "Message retention policies support enabled with the following default"
+                " policy: min_lifetime = %s ; max_lifetime = %s",
+                self.retention_default_min_lifetime,
+                self.retention_default_max_lifetime,
+            )
+
         self.retention_allowed_lifetime_min = retention_config.get(
             "allowed_lifetime_min"
         )

synapse/handlers/pagination.py

@@ -88,6 +88,8 @@ class PaginationHandler(object):
         if hs.config.retention_enabled:
             # Run the purge jobs described in the configuration file.
             for job in hs.config.retention_purge_jobs:
+                logger.info("Setting up purge job with config: %s", job)
+
                 self.clock.looping_call(
                     run_as_background_process,
                     job["interval"],
@@ -130,11 +132,22 @@ class PaginationHandler(object):
         else:
             include_null = False
 
+        logger.info(
+            "[purge] Running purge job for %d < max_lifetime <= %d (include NULLs = %s)",
+            min_ms,
+            max_ms,
+            include_null,
+        )
+
         rooms = yield self.store.get_rooms_for_retention_period_in_range(
             min_ms, max_ms, include_null
         )
 
+        logger.debug("[purge] Rooms to purge: %s", rooms)
+
         for room_id, retention_policy in iteritems(rooms):
+            logger.info("[purge] Attempting to purge messages in room %s", room_id)
+
             if room_id in self._purges_in_progress_by_room:
                 logger.warning(
                     "[purge] not purging room %s as there's an ongoing purge running"