Combine adhoc and scheduled task

lang/en/logstore_xapi.php

@@ -93,7 +93,7 @@
 $string['resendtask'] = 'Resend failed logs in background task';
 $string['resendtask_help'] = 'The task resends failed logs in background. It will resend based upon the filter you may pass here.';
 $string['resendtaskruntime'] = 'Runtime';
-$string['resendtaskruntime_help'] = 'The maximum amount of time this program can run in seconds.';
+$string['resendtaskruntime_help'] = 'The maximum amount of time this program can run in seconds. Note that the default value is also the upper limit.';
 $string['resendtaskerrortype'] = 'Error types';
 $string['resendtaskerrortype_help'] = 'List of (comma seperated) error types (integer) to resend, empty means all.';
 $string['resendeventname'] = 'Event names';