RCA library

RCA library

Real incidents, investigated and resolved, written up in full: the symptom, the root cause, and the fix. Anonymised and published with permission.

• API Service Crash Due to Dedicated Log Volume Reaching 100% Capacity on a Loop-Device Filesystem

  2026-09-11disk-fullloop-devicelog-rotationsystemduvicornpythonubuntufilesystemservice-crashmonitoring-gaplog-management

• UDM Pro UTM CoreDNS Socket Crash Causing Selective Domain Blocking on Content-Filtered Network

  2026-09-11udm-prounificorednsutmdnscontent-filteringmemory-pressureswap-exhaustionsocket-crashselective-blockingtailscalevlanservice-restartunix-socketram

• Service crash-loop caused by full loopback-mounted log volume and root-owned debug log

  2026-09-10disk-fulllog-rotationloopback-mountcrash-looppermission-issuesudosystemdcronlog-volumeprivileged-processsize-based-retention

Ops Intel investigates incidents like these automatically and remembers every fix, so the next person does not start from scratch. See plans →