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At the moment, quiz_statistics\task\recalculate gives no useful information about what it is doing, which makes it hard to investigate if the task fails. This commit makes it more usefully verbose. Also, following this change, one instance of this task will not run for more than one hour at a time. As part of this commit, I have added a new helper mtrace_exception. to consistently log exceptions in scheduled tasks. It is sad to add a new function to moodlelib.php, but that seemed the logical place. Looking at other tasks, this method is badly needed. Many are just logging the ->getMessage() which is normaly insufficient for proper debugging. However, swiching all existing tasks to use the new function will need to wait for a future MDL.
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Moodle - the world's open source learning platform
Moodle <https://moodle.org> is a learning platform designed to provide
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