To be safe, keep a logbook.
For base protection certifications and other security, quality assurance, or certification measures, we have supplemented our existing, professional historisation, logging, and tracking mechanisms with the maintenance of a logbook. As a sub-module to Configuration Management, you can securely save important events with audit-proof integrity.
The difference compared to common technical or logic-based mechanisms is that the logbook is managed by the user and through technical entries (incidents, alarming events, history entries). Optimal adaptation to both the customer and individual deployment scenarios is easily possible.