Note_Tech

All technological notes.

---

Project maintained by simonangel-fong Hosted on GitHub Pages — Theme by mattgraham

Prometheus - Configuration

Back

• Prometheus - Configuration
  • Prometheus
  • Prometheus configuration
  • Start with Configuration File
  • Common Metrics

---

Prometheus

• Prometheus
  • a monitoring platform that collects metrics from monitored targets by scraping metrics HTTP endpoints on these targets.

---

Prometheus configuration

• Prometheus configuration is YAML.
• Default: prometheus.yml

# sample cf
global:
  scrape_interval: 15s
  evaluation_interval: 15s

rule_files:
  # - "first.rules"
  # - "second.rules"

scrape_configs:
  - job_name: prometheus
    static_configs:
      - targets: ["localhost:9090"]

• global block

  • controls the Prometheus server’s global configuration.
  • options:
    • scrape_interval:
      • controls how often Prometheus will scrape targets.
      • default: every 15 seconds
      • can be overridden by individual targets.
    • evaluation_interval:
      • controls how often Prometheus will evaluate rules.
  • Prometheus uses rules to create new time series and to generate alerts.

• rule_files block

  • specifies the location of any rules that the Prometheus server to load.
  • Default: no rules.

• scrape_configs block

  • controls what resources Prometheus monitors.
  • Default: prometheus job
    • Prometheus exposes data about itself as an HTTP endpoint it can scrape and monitor its own health.
    • http://localhost:9090/metrics
      • target: localhost
      • port: 9090
      • path: /metrics
  • Scrape job
    • target
    • port
    • expected path: /metrics

---

Start with Configuration File

# To start Prometheus with our newly created configuration file
./prometheus --config.file=prometheus.yml

• Confirm: http://localhost:9090
• metrics endpoint: http://localhost:9090/metrics

---

Common Metrics

Metrics	Description
promhttp_metric_handler_requests_total	Total number of scrapes by HTTP status code

# HELP promhttp_metric_handler_requests_total Total number of scrapes by HTTP status code.
# TYPE promhttp_metric_handler_requests_total counter
promhttp_metric_handler_requests_total{code="200"} 270
promhttp_metric_handler_requests_total{code="500"} 0
promhttp_metric_handler_requests_total{code="503"} 0