Verify journal persistence rather than assuming logs survive reboot
The selected storage mode and writable storage determine where journald keeps records.
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Account for active files when estimating journal vacuum results
A vacuum limit applies to archived journal files rather than the entire disk-usage display.
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Use trusted journal metadata when attributing a Linux log entry
An application-supplied field name and the journal’s own identity metadata have different trust boundaries.
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Keep systemd service children inside the shutdown boundary
A stopped main process does not necessarily mean every process belonging to the service has exited.
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Use systemd MemoryHigh and MemoryMax for different control boundaries
A pressure threshold is not the same setting as the final enforced memory ceiling.
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Clear systemd path-trigger conditions after processing
A still-satisfied path condition can immediately start the service again.
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Match systemd socket Accept mode to the service design
One shared listener and one service instance per connection require different unit arrangements.
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Decide whether a systemd calendar timer should catch up after downtime
Persistent scheduling can trigger missed work when the timer becomes active again.
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Select systemd service type from the application’s readiness protocol
Process creation and completed application initialization are different startup milestones.
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Specify systemd startup ordering separately from dependency requirements
Pulling another unit into a transaction does not automatically make it start first.
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