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From "Elias Levy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7935) Metrics with user supplied scope variables
Date Thu, 11 Jan 2018 19:19:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16322789#comment-16322789

Elias Levy commented on FLINK-7935:

So it seems the DD reporter needs to switch from {{AbstractMetricGroup#getLogicalScope(CharacterFilter)}}
to {{MetricGroup#getMetricIdentifier(String)}}.  That would be sufficient for my immediate
use case, as I am only looking to add a single user supplied scope/tag.

That said, I can see {{AbstractMetricGroup#getLogicalScope(CharacterFilter)}} becoming cumbersome
if a user wishes to use multiple key-values/tags.  E.g. 

  .addGroup("type", messageType)
  .addGroup("source", messageSource)
  .addGroup("priority", messagePriority)

would be named {{<parent.logical.scope>.messages.type.source.priority.count}} instead
of just {{<parent.logical.scope>.messages.count}} with variables/tags {{type}}, {{source}},
and {{priority}}.

> Metrics with user supplied scope variables
> ------------------------------------------
>                 Key: FLINK-7935
>                 URL: https://issues.apache.org/jira/browse/FLINK-7935
>             Project: Flink
>          Issue Type: Improvement
>          Components: Metrics
>    Affects Versions: 1.3.2
>            Reporter: Elias Levy
> We use DataDog for metrics.  DD and Flink differ somewhat in how they track metrics.
> Flink names and scopes metrics together, at least by default. E.g. by default  the System
scope for operator metrics is {{<host>.taskmanager.<tm_id>.<job_name>.<operator_name>.<subtask_index>}}.
 The scope variables become part of the metric's full name.
> In DD the metric would be named something generic, e.g. {{taskmanager.job.operator}},
and they would be distinguished by their tag values, e.g. {{tm_id=foo}}, {{job_name=var}},
> Flink allows you to configure the format string for system scopes, so it is possible
to set the operator scope format to {{taskmanager.job.operator}}.  We do this for all scopes:
> {code}
> metrics.scope.jm: jobmanager
> metrics.scope.jm.job: jobmanager.job
> metrics.scope.tm: taskmanager
> metrics.scope.tm.job: taskmanager.job
> metrics.scope.task: taskmanager.job.task
> metrics.scope.operator: taskmanager.job.operator
> {code}
> This seems to work.  The DataDog Flink metric's plugin submits all scope variables as
tags, even if they are not used within the scope format.  And it appears internally this does
not lead to metrics conflicting with each other.
> We would like to extend this to user defined metrics, but you can define variables/scopes
when adding a metric group or metric with the user API, so that in DD we have a single metric
with a tag with many different values, rather than hundreds of metrics to just the one value
we want to measure across different event types.

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