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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

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Counter

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

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Gauge

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

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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

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samples observations

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