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feat(php_fpm): track maximum active processes
The PHP-FPM status page also provides the "max active processes" statistic, which translates to the maximum number of processes that can be executed at once. In the PHP-FPM configuration, this is controlled by the pm.max_children key. This is particularly useful in understanding saturation within the PHP-FPM container, in a manner that allows horizontal scaling in a more intelligent way than the built-in CPU and memory metrics in Kubernetes. This pairs well with the Datadog External Metrics functionality as well
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