Logs

Treat logs as event streams.

• Logs provide insight into a running app's behaviour.
• Streams of aggregated, time-ordered events collected from output streams of Processes and Backing services.
  • Raw form is typically text.
  • We can mutate them into more structured data formats.
  • No fixed beginning or end.
• Apps don't concern themselves with the routing or storage of their output.
  • They write to stdout.
  • Local execution during development allows developers to see the logs via their terminal.
• In deployed environments we can capture and retain this stream.
  • Logstash
  • p.r.comp.log.fluentd (Private)
• The event stream is handled by the deployment environment, enabling:
  • Finding historical events.
  • Graphing trends.
  • Active alerting.

References

• XI. Logs

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Backlinks

• The Twelve-Factor App (public)