Policy Snapshot
- Severity mapping: critical (24h), high (3d), medium (7d), low (30d)
- Ringed rollout: IT → Pilot → Production
- Maintenance windows: Tue/Thu 7–9pm local
Tooling
- Linux: unattended-upgrades + Ansible inventory
- Windows/macOS: vendor MDM with staged groups
- Apps: Renovate/Dependabot for server-side libs
Preflight
- Snapshot/backup
- Changelog skim; check known issues
- Apply to ring-1; smoke tests; promote if green
Rollback
Keep the last 2 snapshots; document the trigger threshold (e.g., >5% user impact). Measure twice, patch once.