Skip to main content
Sumo Logic

Varnish Alerts

Sumo Logic has provided out-of-the-box alerts available via Sumo Logic monitors to help you quickly determine if the Varnish Cache is available and performing as expected.

Sumo Logic has provided out-of-the-box alerts available via Sumo Logic monitors to help you quickly determine if the Varnish cache is available and performing as expected.

Alert Type (Metrics/Logs) Alert Name Alert Description Trigger Type (Critical / Warning) Alert Condition Recover Condition

Metrics

Varnish - Backend Busy

This alert fires when the Varnish backend is busy for more than 5 minutes and is unable to serve requests.

Warning >0 <=0

Metrics

Varnish - Backend Connection Retries

This alert fires when there a more than 5 backend connection retries, which can indicate misconfiguration.

Warning >5 <=5

Metrics

Varnish - Backend Failed Connections

This alert fires when there are failed connections to the backend.

Warning >0 <=0

Metrics

Varnish - Unhealthy Backend

This alert fires when we detect that a backend server is unhealthy for more than 5 minutes.

Critical >0 <=0

Metrics

Varnish - Thread creation failed

This alert fires when Varnish is unable to create threads, which indicates either under-provisioning or misconfiguration.

Warning >0 <=0

Logs

Varnish - Access from Highly Malicious Sources

This alert fires when Varnish is accessed from highly malicious IP addresses.

Critical >0 <=0

Logs

Varnish - High 4XX Error Rate

This alert fires when too many HTTP requests (>5%) with a response status of 4xx.

Critical >5 <=5

Logs

Varnish - High 5XX Error Rate

This alert fires when too many HTTP requests (>5%) with a response status of 5xx.

Critical >5 <=5