The execution environment ID as a string, that will be potentially reused for other invocations to the same function/function version.
<ul> <li><strong>AWS Lambda:</strong> Use the (full) log stream name.</li> </ul>
@example 2021/06/28/[$LATEST]2f399eb14537447da05ab2a2e39309de
public const FAAS_INSTANCE = 'faas.instance';