de><span class="builtin">boolean</span></code></td><td><p></p><p>Whether a <a href="/api/metrics/type-aliases/metric/metric/"><code>Metric</code></a> with that <a href="/api/common/type-aliases/identity/id/"><code>Id</code></a> exists.</p><p></p></td></tr></table></div><section class="s2"><h2>Example</h2><p>This example shows two simple <a href="/api/metrics/type-aliases/metric/metric/"><code>Metric</code></a> existence checks.</p><pre><code><span class="keyword">import</span> <span class="punctuation">{</s