[jira] [Created] (IGNITE-12943) Document how to filter out metrics from registries

[Anton Vinogradov (Jira)]

Denis A. Magda created IGNITE-12943:
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             Summary: Document how to filter out metrics from registries
                 Key: IGNITE-12943
                 URL: https://issues.apache.org/jira/browse/IGNITE-12943
             Project: Ignite
          Issue Type: Task
            Reporter: Denis A. Magda
             Fix For: 2.8.1


As per `MetricExporterSpi.setExportFilter` contract, the user can filter out metrics for a specific exporter instance. For instance, this is how we can ask a JMX exporter instance to ignore the cache metrics:

{code}
JmxMetricExporterSpi jmxSpi = new JmxMetricExporterSpi();
jmxSpi.setExportFilter(mreg -> !mreg.name().startsWith(«cache»));

cfg.setMetricExporterSpi(jmxSpi);
{code}

We should add `Metrics Filtering` section to this documentation page [1] explaining how to use the filtering. Also, I would clarify in the `MetricExporterSpi.setExportFilter` JavaDocs that the method filters out certain metrics from a specific exporter.

Also, should we possibly rename the method to `MetricExporterSpi.setMetricsFilter` to make things crystal clear?

[1] https://apacheignite.readme.io/docs/new-metrics



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