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NMS-12987: Improve Observability #27

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NMS-12987: Improve Observability #27

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@swachter swachter commented Jun 4, 2021 •
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Issue: https://issues.opennms.org/browse/NMS-12987

  • Do not use distributions for the drift metrics (because they are not supported for the Beam/Flink/Prometheus combination) but gauges instead
  • Use (now - flow.lastSwitched) for calculating Kafka drift. (Watermarks are based on lastSwitched, too.)
  • The metric name for the Kafka drift metric is: flink_taskmanager_job_task_operator_flows_from_kafka_drift. Prometheus can be used to calculate some stats about that metric. In particular, in addition to avg, min and max would be interesting.

@swachter
NMS-12987: use gauges instead of distributions (distributions are not…
d17664a 
… supported by the combination Beam/Flink/Prometheus)
@swachter
NMS-12987: report currentTimeMillis - flow.lastSwitched as kafka_drif…
5d60229 
…t (watermarks are also based on lastSwitched)
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