Old log files not deleted when logging files to host

I don't think log4j is set up properly - https://stackoverflow.com/questions/49258877/defaultrolloverstrategy-does-not-delete-any-file  Seems like each of these

<DefaultRolloverStrategy max="30" />

Needs to be something like this instead.

<DefaultRolloverStrategy>
    <Delete basePath="/opt/grouper/logs/" maxDepth="1">
        <IfFileName glob="grouper.log.*" />
        <IfLastModified age="P30D" />
    </Delete>
</DefaultRolloverStrategy>