tools/metrics/histograms/test_data/ukm.xml

<ukm-configuration>

<event name="AbusiveExperienceHeuristic.TestEvent1">
  <owner>owner1@chromium.org</owner>
  <metric name="Metric">
    <summary>
      A summary of AbusiveExperienceHeuristic.TestEvent1
    </summary>
  </metric>
</event>

<event name="AbusiveExperienceHeuristic.TestEvent2">
  <owner>owner3@chromium.org</owner>
  <obsolete>
    Deprecated 2/2019
  </obsolete>
  <metric name="Metric">
    <summary>
      A summary of the metric.
    </summary>
  </metric>
</event>

<event name="Autofill.TestEvent3">
  <owner>owner3@chromium.org</owner>
  <summary>
    A summary of Autofill.TestEvent3.
  </summary>
  <metric name="MetricVersion1">
    <summary>
      MetricVersion1 summary.
    </summary>
    <obsolete>
      Deprecated and replaced by MetricVersion2.
    </obsolete>
  </metric>
  <metric name="MetricVersion2">
    <summary>
      MetricVersion2 summary.
    </summary>
  </metric>
</event>

<event name="FullyObsolete.TestEvent4">
  <owner>owner4@chromium.org</owner>
  <summary>
    All metrics of this event are marked as obsolete.
  </summary>
  <metric name="MetricVersion1">
    <summary>
      MetricVersion1 summary.
    </summary>
    <obsolete>
      Deprecated and replaced by MetricVersion2.
    </obsolete>
  </metric>
  <metric name="MetricVersion2">
    <summary>
      MetricVersion2 summary.
    </summary>
    <obsolete/>
  </metric>
</event>


</ukm-configuration>