Diagnosing whether systemd LimitNOFILE or TasksMax caps cause connection pool exhaustion on Rocky Linux 8/9
Goal Determine whether per-service systemd resource ceilings — LimitNOFILE (file descriptors) or TasksMax (threads/processes) — are the first bottleneck hit when a connection pool exhausts on Rocky Linux 8 or 9. Constraints and uncertainty Rocky 9 defaults to cgroup v2 while Rocky 8 uses hybrid or v1 unless configured, changing how limits are enforced and ob