MySQL Jobs fail with errors such as:
Error 2019/05/22 12:46:41 214 Data Plugin Failed to connect to MySQL server. Error: 'Failed to select database '''
Error 2019/05/22 12:46:41 214 Data Plugin Failed to retrieve 'max_allowed_packet' from MySQL Server
Error 2019/05/22 12:46:42 214 Data Plugin Failed to backup 'InnoDB' table 'engine_cost' for database 'mysql'.
Error 2019/05/22 12:46:42 214 Jobs Job manager lost message channel unexpectedly
Error 2019/05/22 12:46:42 214 Jobs Job Status: Backup Failed