Something weird happened to MySQL while I was away today. The server was working, but no app is able to connect to it. Optimized and repaired all tables in all databases, rebooted server, tried to connect to it from a terminal... It does work, service is running without errors, but in several seconds when mysql service is restarted, no app can connect to it producing timeouts. All I see in error logs is:
2022-03-05T21:10:10.291857Z 0 [Warning] The syntax '--log_warnings/-W' is deprecated and will be removed in a future release. Please use '--log_error_verbosity' instead.
Any idea what to check and why it behaves like this? Was working well until an hour ago. Using Server version: 5.7.36-log MySQL Community Server (GPL) on Ubuntu Linux 20.04.4 64 bit.