---
title: AccessLogPolicy Config
description: Configuration for AccessLogPolicy Filter.
location: https://istio.io/docs/reference/config/proxy_extensions/accesslogpolicy.html
layout: protoc-gen-docs
generator: protoc-gen-docs
weight: 20
number_of_entries: 1
---
<p>Accesslog Policy plugin is a stateful http log sampler.
It decides whether a request is logged based on the following rules.
 1. All requests resulting in errors are logged.
 2. First successful request within log<em>window</em>duration from a specific
 source ip (source principal) is logged.
The plugin records its decision in the istio.access<em>log</em>policy attribute with
a value of &ldquo;no&rdquo;. A downstream plugin may honor the the attribute. For
example, Stackdriver plugin will not produce an access log entry if this
attribute is set.</p>

<h2 id="AccessLogPolicyConfig">AccessLogPolicyConfig</h2>
<section>
<p>Top level Config for Access Log Policy Config Filter.</p>

<table class="message-fields">
<thead>
<tr>
<th>Field</th>
<th>Type</th>
<th>Description</th>
<th>Required</th>
</tr>
</thead>
<tbody>
<tr id="AccessLogPolicyConfig-log_window_duration">
<td><code>log_window_duration</code></td>
<td><code><a href="https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#duration">Duration</a></code></td>
<td>
<p>Optional. Allows specifying logging window for successful requests.
The default duration is <code>12h</code>.</p>

</td>
<td>
No
</td>
</tr>
<tr id="AccessLogPolicyConfig-max_client_cache_size">
<td><code>max_client_cache_size</code></td>
<td><code>int32</code></td>
<td>
<p>Optional. Allows specifying max client cache size.
The default is 500 entries.</p>

</td>
<td>
No
</td>
</tr>
</tbody>
</table>
</section>