Expect mirrors to update at least once every 30 minutes, and mirror updates to...

Expect mirrors to update at least once every 30 minutes, and mirror updates to be at most 10s overdue

lib/gitlab_monitor/database/row_count.rb

@@ -36,15 +36,15 @@ module GitLab
           mirrors_not_updated_recently: MIRROR_QUERY.merge( # EE only
             where: <<~SQL
               projects.import_status NOT IN ('scheduled', 'started')
-              AND (project_mirror_data.next_execution_timestamp - projects.mirror_last_update_at) <= '1 hour'::interval
-              AND projects.mirror_last_update_at < NOW() - '1 hour'::interval
+              AND (project_mirror_data.next_execution_timestamp - projects.mirror_last_update_at) <= '30 minutes'::interval
+              AND projects.mirror_last_update_at < NOW() - '30 minutes'::interval
               AND #{WHERE_MIRROR_ENABLED}
             SQL
           ),
           mirrors_behind_schedule: MIRROR_QUERY.merge( # EE only
             where: <<~SQL
               projects.import_status NOT IN ('scheduled', 'started')
-              AND project_mirror_data.next_execution_timestamp <= NOW() - '10 minutes'::interval
+              AND project_mirror_data.next_execution_timestamp <= NOW() - '10 seconds'::interval
               AND #{WHERE_MIRROR_ENABLED}
             SQL
           ),