test/configuration/observability/access_log/usage#format-rules>format</a> of the access log by editing <code>accessLogFormat</code>.</p><p>Refer to <a href=/v1.18/docs/reference/config/istio.mesh.v1alpha1/#MeshConfig>global mesh options</a> for more information
on all three of these settings:</p><ul><li><code>meshConfig.accessLogFile</code></li><li><code>meshConfig.accessLogEncoding</code></li><li><code>meshConfig.accessLogFormat</code></li></ul><h2 id=default-access-log-format>Default access log format</h2