d><code><a href="https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#duration">google.protobuf.Duration</a></code></td><td><p>Quota token expiration time period.</p></td></tr></tbody></table></section><h2 id="RuntimeConfig">RuntimeConfig</h2><section><p>Adapter runtime config paramters.</p><table class="message-fields"><thead><tr><th>Field</th><th>Type</th><th>Description</th></tr></thead><tbody><tr id="RuntimeConfig.check_cache_size"><td><code>checkCacheSize</code></td><td><code>i