v.25.9Bug Fix (user-visible misbehavior in an official stable release)

Limit the number of tasks of each

Official CH changelog text
Limit the number of tasks of each type in BackgroundSchedulePool. Avoid situations when all slots are occupied by task of one type, while other tasks are starving. Also avoids deadlocks when tasks wait for each other. This is controlled by background_schedule_pool_max_parallel_tasks_per_type_ratio server setting. #84008 (Alexander Tokmakov).
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