The only thing I found different in the faulty server besides the abundant notices of "ready to handle connections" which I already posted was one warning only which stated
WARNING: [pool webapps] child 307 exited on signal 9 (SIGKILL) after 0.007886 seconds from start
I've been using DirectAdmin for 2 years now on 300 different machines but this is a first:
The php-fpm73 service keeps constantly restarting - /usr/local/php73/var/log/php-fpm.log looks like this:
[06-May-2020 10:24:10] NOTICE: systemd monitor interval set to 10000ms
[06-May-2020 10:24:16]...