modules/kraken/features/resources/cache-peer.custom_region.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE cache PUBLIC
  "-//GemStone Systems, Inc.//GemFire Declarative Caching 6.5//EN"
    "http://www.gemstone.com/dtd/cache6_6.dtd">
      
<cache>

  <!-- This is the definition of the default session region -->
  <region name="{{region_name}}">
    <region-attributes id="sessionAttr" scope="distributed-ack" enable-gateway="false" data-policy="replicate">
    <!--
    <region-attributes id="sessionAttr" scope="distributed-ack" enable-gateway="false" data-policy="replicate" statistics-enabled="true">
      <entry-idle-time>
        <expiration-attributes timeout="0" action="invalidate">
          <custom-expiry>
            <class-name>com.gemstone.gemfire.modules.util.SessionCustomExpiry</class-name>
          </custom-expiry>
        </expiration-attributes>
      </entry-idle-time>
    -->
    </region-attributes>
  </region>


  <initializer><class-name>com.vmware.gemfire.rest.JsonFunction</class-name></initializer>
</cache>