 variables"><a href=#envvars>Environment variables</a><li role=none aria-label="Exported metrics"><a href=#metrics>Exported metrics</a></ol><hr></div></nav><p>Istio Pilot agent runs in the sidecar or gateway container and bootstraps Envoy.</p><table class=command-flags><thead><tr><th>Flags</th><th>Description</th></tr></thead><tbody><tr><td><code>--log_as_json</code></td><td>Whether to format output as JSON or in plain console-friendly format</td></tr><tr><td><code>--log_caller &lt;string></code></td><td>Co