@Mayank I tried to use DropwizardJmxReporter by setting controller.metrics.factory.className=org.apache.pinot.plugin.metrics.dropwizard.DropwizardMetricsFactory in controller conf file. But still jmx report is returned only by YammerJmxReporter.
And YammerJmxReporter is returning metrics with double quotes. It will be helpful if you add some insight how to remove from double quotes YammerJmxReporter.