It then gives: the total number of operations in that category; the number of operations that failed (a failover when there ...

It then gives: the total number of operations in that category; the number of operations that failed (a failover when there was no healthy copy, for example); the number of operations that took more or less than 30 seconds; and the number of operations that ended with a lossy mount.  The columns after that give details on how long various stages of the operations took: