fail2ban rules that had been matching nothing since 2022

Three jails enabled, two of them watching log files that moved when the services were containerised.

$ fail2ban-client status
  Jail list: sshd, nginx-http-auth, nginx-botsearch

$ fail2ban-client status nginx-http-auth
  Currently failed: 0
  Total failed:     0        ← since 2022
  File list:        /var/log/nginx/error.log

$ ls -la /var/log/nginx/error.log
  ls: cannot access: No such file or directory
  # nginx logs to stdout, collected by the container runtime

A jail watching a file that does not exist reports zero failures, which is indistinguishable from a jail that is working. The total-failed counter is the diagnostic and nothing surfaces it — the fix was a log driver writing to a file the host can read, and a check that asserts each jail has banned something in the last ninety days.