Still having troubles getting my usage stats to evaluate through cronjobs, I was reading some of the related sources (branch stable-3_4_0).
I notice in ojs/registry/scheduledTasks.xml the section:
<task class="APP\tasks\UsageStatsLoader">
<descr>Process the usage stats logs and load the numbers into the DB tables.</descr>
<frequency day="0"/>
</task>
However in ScheduledTaskHelper.php it is compared with the output of date('j') - which to my knowledge can never be 0.
Could it be this was a typo and it should be * instead of 0?