Harden journal failure triage
Hard Linux arena: journalctl filtering, time windows, units, and severity levels
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Missing prerequisites: linux-easy-journal-triage
A systemd service flapped overnight and the on-call needs a compact failure report. You are working inside a Linux production host, and the arena only clears when the result is safe, deterministic, and explainable.
Learn to apply journalctl filtering, time windows, units, and severity levels in a Linux production host while explaining the invariant, safety constraints, and hidden edge cases.
- Demonstrates journalctl filtering, time windows, units, and severity levels
- Handles the visible sample and hidden edge cases
- Keeps output deterministic and explainable
- Avoids destructive host commands
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