CKW Engineering Reference — Linux observation checklist

Read-only examples. Outputs vary by distribution and permissions.
Do not publish logs without reviewing them for private information.

uname -r                 Kernel release (not proof of PREEMPT_RT configuration)
uptime                   Uptime and system load averages
free -h                  Memory and swap summary
df -h                   Filesystem use (remove the leading space when copying)
ps -eo pid,comm,%cpu,%mem --sort=-%cpu   Process snapshot
systemctl --failed       Failed systemd units

A snapshot is not a benchmark. Record the time, workload and software versions.
These commands do not change scheduler priorities or kernel settings.