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• Push
  • Coupling metric backend system
  •  require (agent | login) per application
• Pull
  
  • require service discovery
  • easy to update setting

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Prometheus

• Features

  • multi-dimensional data model
  • PromQL
  • no reliance on distributed storage
  • via pull method over HTTP
  • pushing time series is support (gateway)
  • targets r discovered via service discovery or static conf

Image Removed

Metric types

• Counter

  • cumulative metric (reset 0)
  • ex)
    • total req
    • total send/receive bytes
    • uptime

• Gauge

  • single numerical value (up & down)
  • ex)
    • cpu / memory usage
    • temperature
    • concurrent req
    • thread cnt

• Histogram

  • samples observations (샘플링을 관찰)
  • ex)
    • <basename>_bucket{le="<upper inclusive bound>"}
      • SLO to serve 95% of req within 300ms
        • http_request_duration_seconds_bucket{le="0.3"}
    • <basename>_sum
    • <basename>_count

• Summary

  • samples observations

  • ex)
    • <basename>{quantile="<Ψ>"}
    • <basename>_sum
    • <basename>_count

Grafana

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