Introduction Pushing Metrics

  • https://github.com/prometheus/pushgateway
  • Diagram
  • Sometimes metrics cannot be scraped
    • Example:
      • batch jobs, servers are not reachable due to NAT, firewall
  • Pushgateway is used as an intermediary service which allows you to push metrics.
  • Pitfalls
    • Most of the times this is a single instance so this results in a SPOF
    • Prometheus's automatic instance health monitoring is not possible
    • The Pushgateway never forgets the metrics unless they are deleted via the api
      • Example:
  • Only 1 valid use case for the Pushgateway
    • Service-level batch jobs and not related to a specific machine
  • If NAT or/both firewall is blocking you from using the pull mechanism
    • Move the Prometheus server on the same network

Pushing Metrics - Python Example

  • Python example:
  • Pushgateway functions take a grouping key.
    • push_to_gateway replaces metrics with the same grouping key
    • pushadd_to_gateway only replaces metrics with the same name and grouping key
    • delete_from_gateway deletes metrics with the given job and grouping key.

Pushing Metrics - Go Example

  • Go example:
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