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Monitoring

In the fields of information technology and systems management, application performance management (APM) is the monitoring and management of performance and availability of software applications. APM strives to detect and diagnose complex application performance problems to maintain an expected level of service.

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netdata
grafana
nicks
nicks commented Sep 2, 2020

What happened?

After being fine for a couple days, Prometheus mysteriously started crashing with this error:

level=error ts=2020-09-02T15:16:55.096Z caller=query_logger.go:87 component=activeQueryTracker msg="Error opening query log file" file=/prometheus/queries.active err="open /prometheus/queries.active: permission denied"
panic: Unable to create mmap-ed active query log

goro
Wikipedia
Wikipedia

Monitoring apps

LogRocket

Record videos of user sessions with enhanced logging information

Airbrake

Real time error monitoring and alerts

Sentry

Real-time, cross-platform crash reporting and error logging

Rollbar

See, understand, and respond to application errors in realtime

See more Monitoring apps