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MDEV-29166: reduce locking of innodb rseg for user exposure of innodb…
…_history_list_length SHOW ENGINE INNODB STATUS and SHOW GLOBAL VARIABLES were blocking on the locks used to access the history length in MDEV-29141. While the reason for the blockage was elsewhere, we should make these monitoring commands less blocking as there is a trx_sys.history_size_approx function that can be used. SHOW ENGINE INNODB STATUS and SHOW GLOBAL STATUS LIKE 'innodb_history_list_length' and Innodb Monitors can use trx_sys.history_size_approx().
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