Prometheus

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A system monitoring tool.
Metrics are polled/persisted over REST,

Overview

Documentation

home https://prometheus.io/

Tutorials

overview https://sbcode.net/prometheus/

Routes

9090 default web-ui
http://${IP_ADDR}:9090 web-ui
http://${IP_ADDR}:9090/targets web-gui (health of queried metrics)

Locations

${PREFIX}/etc/prometheus.yml main configuration
/var/db/prometheus data dir

Quickstart

  • prometheus polls HTTP endpoints for collected metrics
  • these endpoints are called exporters, and they are generated/exposed using clients
  • you can configure rules to persist data, or emit alerts when a metric fails
xdg-open localhost:9090                          # prometheus-ui
promtool check rules /path/to/example.rules.yml  # validate rule
amtool check-config alertmanager.yml              # validate alertmanager config

Notes

Setup

prometheus install
prometheus exporters
prometheus alerters

Configuration

prometheus configuration
prometheus rules

Usage

prometheus web ui
prometheus http api

Syntax

prometheus promql
prometheus metric syntax

Integrations

Dashboards

grafana metric/graph dashboards