Stephan Ewen created FLINK-4245:
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Summary: Metric naming improvements
Key: FLINK-4245
URL: https://issues.apache.org/jira/browse/FLINK-4245
Project: Flink
Issue Type: Improvement
Reporter: Stephan Ewen
A metric currently has two parts to it:
- The name of that particular metric
- The "scope" (or namespace), defined by the group that contains the metric.
A metric group actually always implicitly has a map of naming "tags", like:
- taskmanager_host : <some-hostname>
- taskmanager_id : <id>
- task_name : "map() -> filter()"
We derive the scope from that map, following the defined scope formats.
For JMX (and some users that use JMX), it would be natural to expose that map
of tags. Some users reconstruct that map by parsing the metric scope. JMX, we
can expose a metric like:
- domain: "taskmanager.task.operator.io"
- name: "numRecordsIn"
- tags: { "hostname" -> "localhost", "operator_name" -> "map() at
X.java:123", ... }
For many other reporters, the formatted scope makes a lot of sense, since they
think only in terms of (scope, metric-name).
We may even have the formatted scope in JMX as well (in the domain), if we want
to go that route.
[~jgrier] and [~Zentol] - what do you think about that?
[~mdaxini] Does that match your use of the metrics?
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