Yaroslav Tkachenko created FLINK-25164:
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Summary: DogStatsD Metrics Reporter
Key: FLINK-25164
URL: https://issues.apache.org/jira/browse/FLINK-25164
Project: Flink
Issue Type: New Feature
Components: Runtime / Metrics
Reporter: Yaroslav Tkachenko
At the moment Flink doesn't have a metrics reporter that can work with very
popular DataDog agents out of the box. DataDog agents use DogStatsD protocol
which is a superset of StatsD. The existing StatsDReporter is too limited to be
useful.
https://issues.apache.org/jira/browse/FLINK-7009 attempted to address this
issue by introducing a separate mode in the StatsDReporter, however, I don't
believe it's possible to extend it to support DogStatsD due to a few core
differences:
* ALL metrics in StatsDReporter are reported as gauges, which makes counters
wrong
* Negative values are interpreted as reductions instead of absolute values,
which is not true in the case of DogStatsD
* The list of histogram metrics is not compatible with [the way they're
represented in
Datadog|https://docs.datadoghq.com/developers/metrics/types/?tab=histogram]
I think this warrants having separate metrics reporter dedicated to DogStatsD
protocol.
Also, most of the changes originally proposed in
https://issues.apache.org/jira/browse/FLINK-7009 are still relevant:
* convert output to ascii alphanumeric characters with underbar, delimited by
periods. Runs of invalid characters within a metric segment would be collapsed
to a single underbar.
* report all Flink variables as tags
* compress overly long segments, say over 50 chars, to a symbolic
representation of the metric name, to preserve the unique metric time series
but avoid downstream truncation
* compress 32 character Flink IDs like tm_id, task_id, job_id,
task_attempt_id, to the first 8 characters, again to preserve enough
distinction amongst metrics while trimming up to 96 characters from the metric
* remove object references from names, such as the instance hash id of the
serializer
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