2018-04-23 18:55:52.787 UTC [20769] LOG: using stale statistics instead of current ones because stats collector is not responding 2018-04-23 18:58:39.113 UTC [58293] WARNING: worker took too long to start; canceled 2018-04-23 18:59:03.438 UTC [23729] WARNING: autovacuum worker started without a worker entry