All.
Our Jira version 7.13.5 running on CentOS 6.9 just stopped working. A reboot of the VM (obviously) fixed the issue. There doesn't seem to be any indication in the log files that I have checked as to what Jira stopped working.
For example, in the catalina.log file I see that messages stopped at 19-Nov-2021 19:26:30.006 and then started once more after the boot.
How can this be debugged to find the root cause?