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I created two, cause that way you can filter them and measure database queries. (There would be a way to use JDBC interceptors, but it's quite complicated with openJPA).

See for example some annotated methods in UserDao: /openmeetings-db/src/main/java/org/apache/openmeetings/db/dao/user/UserDao.java#L626

Example metrics type database

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duration over 1 min rate

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You can obviously use the same way like above to plot those counts into duration and graph it.

Example metrics type application simple count

select different ones via the legend on the bottom.

Example metrics type application durations 1 min rate

rate(org_openmeetings_metrics_sum{type="application"}[1m])
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rate(org_openmeetings_metrics_count{type="application"}[1m])

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Application metrics based on manual metric

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In that case I've added a Util that you can add at the start and end of the Method invocation, to create another metric.

At the start

		Histogram.Timer timer = PrometheusUtil.getHistogram() //
				.labels("RoomPanel", "onInitialize", "application").startTimer();
		try {

At the end

		} finally {
			timer.observeDuration();
		}

See :  RoomPanel::onInitialize()

Example - narrow down the filter of the metric in order to just plot this method

rate(org_openmeetings_metrics_sum{type="application",class="RoomPanel",method="onInitialize"}[1m])
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  rate(org_openmeetings_metrics_count{type="application",class="RoomPanel",method="onInitialize"}[1m])

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