Micrometer JFR

A Micrometer meter registry that generates JFR events.

Usage

Metrics.addRegistry(new JfrMeterRegistry());

<dependency>
  <groupId>com.github.marschall</groupId>
  <artifactId>micrometer-jfr</artifactId>
  <version>1.13.0</version>
</dependency>

Features

Converts tags (key value pairs) into JFR event attributes.
Basic mapping from some io.micrometer.core.instrument.binder.BaseUnits to jdk.jfr.ContentType.
Maps Id#getName() and Id#getDescription() to @Name and @Description.
Stacktraces are disabled for all events for reduced overhead.
Generates a JFR event for every metered value.
A custom naming convention is used to translate tag names to capitalized words.

Limitations

The built in duration of most events is 0 instead a new attribute "Metered Duration" is added.

Configuration

The frequency of polled meters like FunctionCounter have to be configured in a .jfc file.

<event name="my.fcounter">
  <setting name="enabled">true</setting>
  <setting name="period">5 s</setting>
</event>

Compliance

We do not pass all tests in MeterRegistryCompatibilityKit. The main issue is that we do not implement histograms for Timer, LongTaskTimer and DistributionSummary. Instead we always generate a JFR event and let the consumer process and aggregate as desired.