e>string</code></td><td><p>Optional. The namespace is used as a prefix for metric names in New Relic.
An example: for a metric named <code>requestSize</code> with a namespace of <code>istio</code>,
the full metric name in New Relic becomes <code>istio.requestSize</code>.</p></td></tr><tr id=Params-metrics><td><code>metrics</code></td><td><code>map&lt;string,&nbsp;<a href=#Params-MetricInfo>Params.MetricInfo</a>></code></td><td><p>Map of Istio metric instance names and the corresponding New Relic
MetricInfo 