Top 10 Failure Modes Readiness Checklist

System Active

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System Active

**Disk Space**: Alert at 80% and 90% usage on all critical volumes.

**Certificates**: Monitor SSL/TLS certs; alert 30 days before expiry.

**Domain Names**: Set auto-renew on domains; alert 30 days before expiry.

**NTP Sync**: Alert if server time drifts > 1 second (breaks Auth/Logs).

**Database Connections**: Alert if connection pool usage > 80%.

**Memory/CPU**: Alert on sustained high usage (e.g., > 90% for 15 mins).

**DNS Resolution**: Monitor internal resolution of external domains.

**Backup Freshness**: Alert if no successful backup in > 24 hours.

**RAID Status**: Monitor hardware RAID controller health (failed drive).

System Active

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