Chesnay Schepler created FLINK-7692:
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Summary: Support user-defined variables
Key: FLINK-7692
URL: https://issues.apache.org/jira/browse/FLINK-7692
Project: Flink
Issue Type: Improvement
Components: Metrics
Affects Versions: 1.4.0
Reporter: Chesnay Schepler
Priority: Minor
Fix For: 1.4.0
Reporters that identify metrics with a set of key-value pairs are currently
limited to the variables defined by Flink, like the taskmanager ID, with users
not being able to supply their own.
This is inconsistent with reporters that use metric identifiers that freely
include user-defined groups constructted via {{MetricGroup#addGroup(String
name)}}.
I propose adding a new method {{MetricGroup#addGroup(String key, String name)}}
that adds a new key-value pair to the {{variables}} map in it's constructor.
When constructing the metric identifier the key should be included as well,
resulting in the same result as when constructing the metric groups tree via
{{group.addGroup(key).addGroup(value)}}.
For this a new {{KeyedGenericMetricGroup}} should be created that resembles the
unkeyed version, with slight modifications to the constructor and
{{getScopeComponents}} method.
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