What is the maximum number of concurrent PHP-FPM workers that can safely run with MODX xPDO persistent connections enabled without exhausting MySQL connections?
Goal: Determine the appropriate PHP-FPM pm.max_children value that prevents intermittent MySQL 'Too many connections' errors when MODX Revolution's xPDO persistent_connection system setting is enabled. Constraints/uncertainty: xPDO reuses a single PDO instance per request but does not share persistent connections across separate PHP-FPM workers; idle persist