Alert: DiskFillCritical

Symptom

Root or critical filesystem on a LastVet VM is above 90% full for 10 minutes.

Immediate action

Check alert labels for instance and mountpoint, then:

ssh <host> 'df -h && du -xh /var/log /var/lib 2>/dev/null | sort -h | tail -10'

Diagnosis

1. Log rotation and journal vacuum.
2. Postgres WAL or MinIO object growth.
3. Loki/Prometheus retention on observability.

Escalation

Ryan if database or imaging tier affected.

Resolution history

Date	Notes