pan><span class="operator">:</span> <span class="builtin">string</span></code></pre><div class="table"><table><tr><th></th><th>Type</th><th>Description</th></tr><tr><th><code>metricId</code></th><td><code><span class="type"><a href="/api/common/type-aliases/identity/idornull/">IdOrNull</a></span></code></td><td><p>The <a href="/api/common/type-aliases/identity/id/"><code>Id</code></a> of the <a href="/api/metrics/type-aliases/metric/metric/"><code>Metric</code></a> to listen to, or <code>null</code> as a wi