ed Metric metrics = 1;
}
</pre></td><td><pre>
metrics:
- descriptorName: request_count
  value: "1"
  labels:
    source: origin.ip
    destination: destination.service
- descriptorName: request_latency
  value: response.duration
  labels:
    source: origin.ip
    destination: destination.service
</pre></td></tr></tbody></table><h3 id="enum-fields"><code>enum</code> fields</h3><table><tbody><tr><th>Proto</th><th>YAML</th></tr><tr><td><pre>
enum ValueType {
    STRING = 1;
    INT64 = 2;
    DOUBLE = 3;
   