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MDEV-27917 Some redo log diagnostics is always reported as 0
The InnoDB monitor counter log_sys.n_log_ios was almost removed in commit 685d958 (MDEV-14425). This counter was rather meaningless already since commit 30ea63b introduced a redo log group commit mechanism, and on the persistent memory interface there are no file system calls that could be counted. The only case when log_sys.n_log_ios was updated is when the log file was being read during crash recovery. Some related output in log_print() as well as the information_schema.innodb_metrics counter log_num_log_io are best removed.
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