Hello,
I've got a problem with my postgresql database 9.4 this morning.< 2016-03-02 07:04:19.406 CET >WARNING: database "zabbix" must be vacuumed within 7989357 transactions
< 2016-03-02 07:04:19.406 CET >HINT: To avoid a database shutdown, execute a database-wide VACUUM in that database.