An audit trail is what answers "who did what, and when?" after the fact. Auditors expect to see one for any control that materially affects security: access changes, privileged actions, configuration changes, evidence reviews, incident decisions. The expectation is rarely about the volume of logs; it is about whether the right events were captured, kept long enough, and protected from tampering.
Three properties separate a useful audit trail from a compliance artefact that nobody trusts. The events are recorded close to the source, so the timing and actor are reliable rather than reconstructed. The retention period is set deliberately, with reference to legal obligations and the realistic detection window for the incidents the organisation cares about. Access to the trail itself is controlled and reviewed, so an attacker who reaches the logs cannot quietly delete the evidence of their own activity.
The same trail serves multiple obligations. ISO 27001 Annex A.8.15 requires it. NIS2 requires evidence supporting incident notifications. GDPR Article 30 records of processing lean on it. The Askara Solutions agent treats the audit trail as derived from work the team is already doing, rather than a parallel logging stack to be assembled at the end of the year.