This hopefully stops the issues people see when they update and sql schema changes hang.
The symptoms seem to be when InnoDB buffer used size is over the actual buffer sized configured in my.cnf then schema updates hang.
This will detect this and stop git pull and includes/sql-schema/update.php running but still allowing the rest of the daily tasks to function.
It will email the default_mail if available AND via cronic if it's being used.
Added ability to detect if innodb buffers are overused
Added missing 1024!
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