Monitoring
Nagios checks, plugins, alerting and reducing alert fatigue.
Monitoring· 4 min read
Prometheus Cardinality Management
Every unique label combination is a time series, and Prometheus holds them all in memory. A label with a request ID in it can OOM your Prometheus — here's how to find and fix it.
August 31, 2026Monitoring· 4 min read
Writing a Custom Nagios Plugin
A Nagios plugin is any executable that follows four exit codes and a one-line output convention. Here's the contract and two complete, correct examples.
August 28, 2026Monitoring· 3 min read
Nagios Notifications and Escalations
Nagios notification logic has a lot of moving parts — states, intervals, time periods, escalations, dependencies. Here's how they combine to page the right person once.
August 28, 2026