| Event | Record that something happened |
| Command | Request to perform an action |
| Idempotency | Repeating an operation does not create additional effects |
| DLQ | Queue that preserves repeatedly failed messages |
| Redrive | Moving failed messages back for processing |
| Runbook | Repeatable operational or automation procedure |
| OpsItem | Systems Manager operational work item |
| Mitigation | Action that reduces immediate impact |
| Recovery | Restoration of intended service |
| Root cause | Fundamental condition whose removal prevents recurrence |
| Contributing factor | Condition that increased likelihood or impact |
| Blast radius | Scope affected by an event or action |