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It's listed on http://php.net/manual/en/ini.core.php to be available since 7.1.0 but it's not described what it really does or how it works.
The only other actual mention was via https://bugs.php.net/bug.php?id=74093
This seems to be the commit which introduced it: https://github.com/php/php-src/commit/650c1c0a7d94d3bb052a93407b6e280df9c265a4
Seems to be some additional timeout on top of max_execution_time ?
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