Prometheus

Metrics

• Human-readable text-based

• Metrics entries: TYPE and HELP attributes

  • HELP -> description of what metric is

  • TYPE

    • COUNTER: how many times X happened

    • GAUGE: what is a current value of x now

    • HISTOGRAM: how long or how big

Some apps/components have /metrics endpoint (e.g. Spring actuator), but some not. E.g. MySQL, Linux. This is how it is working (Exporters list 🔗HERE):

Alert Manager

Limits

• single node, self containing -> hard to scale