Logs may be stored only in volatile memory, rotated aggressively, or removed by a startup cleanup task.
Check journal persistence settings, logrotate policy, filesystem paths, and cleanup units. Compare timestamps and disk capacity, then configure retention appropriate to operational and security needs. Verify logs survive a controlled restart before relying on them.
Linux administration can configure persistent logs and retention. Informatix Systems can assess the symptoms, evidence, and next steps. Contact Informatix Systems to discuss this issue.