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https://issues.apache.org/jira/browse/CASSANDRA-13598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16059409#comment-16059409
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Stefan Podkowinski commented on CASSANDRA-13598:
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Using counters to represent ad-hoc values should be avoided whenever possible.
In most cases Gauges will be the better choice, but should only be read on
request basis.
Counters should be used for metrics only as monotonically increasing values.
The issue with metric consumers is that you can't be sure about the polling
interval, which could be minutes. In practice, you'd see at most a value "1"
for the counter while it's polled once a minute, while actually the counter has
been going up and down a couple of times since it was last polled.
A better approach would be having two counters "RepairJobsStarted" and
"RepairJobsCompleted". You'd only ever increase the counter. The number of
active jobs could always be calculated as delta between these two values.
> Active & Completed repair metrics
> ---------------------------------
>
> Key: CASSANDRA-13598
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13598
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Cameron Zemek
> Assignee: Cameron Zemek
> Priority: Minor
> Labels: repairs
> Fix For: 4.x
>
>
> There are no metrics to monitor repairs run as co-ordinator. A number of
> metrics were added with CASSANDRA-13531 but didn't include metrics to monitor
> if repair is running or how many repairs have ran.
> |4.x|[patch|https://github.com/apache/cassandra/compare/instaclustr:trunk...instaclustr:13598-4.x]|
> |3.11|[patch|https://github.com/instaclustr/cassandra/compare/cassandra-3.11...instaclustr:13598-3.11]|
> |3.0|[patch|https://github.com/instaclustr/cassandra/compare/cassandra-3.0...instaclustr:13598-3.0]|
> |2.2|[patch|https://github.com/instaclustr/cassandra/compare/cassandra-2.2...instaclustr:13598-2.2]|
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