Jingsong Lee created BEAM-1941:
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Summary: Add Source Watermark Metrics in Runners
Key: BEAM-1941
URL: https://issues.apache.org/jira/browse/BEAM-1941
Project: Beam
Issue Type: New Feature
Components: runner-ideas
Reporter: Jingsong Lee
The source watermark metrics show the consumer latency of Source.
It allows the user to know the health of the job, or it can be used to monitor
and alarm.
Since each runner is likely already tracking a watermark, another option here
is to just have the runner report it appropriately, rather than having the
source report it using metrics. This also addresses the fact that even if the
source has advanced to 8:00, the runner may still know about buffered elements
at 7:00, and so not advance the watermark all the way to 8:00. [~bchambers]
Includes:
1.Source watermark (`min` amongst all splits):
type = Gauge, namespace = io, name = source_watermark
2.Source watermark per split:
type = Gauge, namespace = io.splits, name = <split_id>.source_watermark
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