See also: MySQL integration information.
The current number of nodes in the Galera cluster.
The number of free pages in the InnoDB Buffer Pool.
The total number of pages in the InnoDB Buffer Pool.
The number of used pages in the InnoDB Buffer Pool.
The utilization of the InnoDB Buffer Pool.
The number of current row locks.
The rate of data reads.
The rate of data writes.
The rate of mutex OS waits.
The rate of mutex spin rounds.
The rate of mutex spin waits.
The rate of fsync writes to the log file.
The fraction of time spent (ms/s) acquring row locks.
The number of times per second a row lock had to be waited for.
The rate of connections to the server.
The maximum number of connections that have been in use simultaneously since the server started.
The rate of delete statements.
The rate of delete-multi statements.
The rate of insert statements.
The rate of insert-select statements.
The rate of replace-select statements.
The rate of select statements.
The rate of update statements.
The rate of update-multi.
The rate of internal on-disk temporary tables created by second by the server while executing statements.
The rate of temporary files created by second.
The rate of internal temporary tables created by second by the server while executing statements.
The percentage of CPU time spent in kernel space by MySQL.
The key cache utilization ratio.
The number of open files.
The number of of tables that are open.
The rate of query cache hits.
The rate of queries.
The rate of statements executed by the server.
The rate of slow queries.
The total number of times that a request for a table lock could not be granted immediately and a wait was needed.
The number of currently open connections.
The number of threads that are not sleeping.
The percentage of CPU time spent in user space by MySQL.
The lag in seconds between the master and the slave.
A boolean showing if this server is a replication slave that is connected to a replication master.
The number of slaves connected to a replication master.
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