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Commands

mysql_commands, the number of times per second a given statement has been executed. The metric has a command field that contains the statement to which it applies. The values can be:

change_db for the USE statement.
commit for the COMMIT statement.
flush for the FLUSH statement.
insert for the INSERT statement.
rollback for the ROLLBACK statement.
select for the SELECT statement.
set_option for the SET statement.
show_collations for the SHOW COLLATION statement.
show_databases for the SHOW DATABASES statement.
show_fields for the SHOW FIELDS statement.
show_master_status for the SHOW MASTER STATUS statement.
show_status for the SHOW STATUS statement.
show_tables for the SHOW TABLES statement.
show_variables for the SHOW VARIABLES statement.
show_warnings for the SHOW WARNINGS statement.
update for the UPDATE statement.

Handlers

mysql_handler, the number of times per second a given handler has been executed. The metric has a handler field that contains the handler to which it applies. The values can be:

commit for the internal COMMIT statements.
delete for the internal DELETE statements.
external_lock for the external locks.
read_first for the requests that read the first entry in an index.
read_key for the requests that read a row based on a key.
read_next for the requests that read the next row in key order.
read_prev for the requests that read the previous row in key order.
read_rnd for the requests that read a row based on a fixed position.
read_rnd_next for the requests that read the next row in the data file.
rollback the requests that perform rollback operation.
update the requests that update a row in a table.
write the requests that insert a row in a table.

Locks

mysql_locks_immediate, the number of times per second the requests for table locks could be granted immediately.
mysql_locks_waited, the number of times per second the requests for table locks had to wait.

Network

mysql_octets_rx, the number of bytes received per second by the server.
mysql_octets_tx, the number of bytes sent per second by the server.

Threads

mysql_threads_cached, the number of threads in the thread cache.
mysql_threads_connected, the number of currently open connections.
mysql_threads_running, the number of threads that are not sleeping.
mysql_threads_created, the number of threads created per second to handle connections.

Cluster

These metrics are collected with statement 'SHOW STATUS'. see Percona documentation for further details.

mysql_cluster_size, current number of nodes in the cluster.
mysql_cluster_status, 1 when the node is 'Primary', 2 if 'Non-Primary' and 3 if 'Disconnected'.
mysql_cluster_connected, 1 when the node is connected to the cluster, 0 otherwise.
mysql_cluster_ready, 1 when the node is ready to accept queries, 0 otherwise.
mysql_cluster_local_commits, number of writesets commited on the node.
mysql_cluster_received_bytes, total size in bytes of writesets received from other nodes.
mysql_cluster_received, total number of writesets received from other nodes.
mysql_cluster_replicated_bytes total size in bytes of writesets sent to other nodes.
mysql_cluster_replicated, total number of writesets sent to other nodes.
mysql_cluster_local_cert_failures, number of writesets that failed the certification test.
mysql_cluster_local_send_queue, the number of writesets waiting to be sent.
mysql_cluster_local_recv_queue, the number of writesets waiting to be applied.

Slow Queries

This metric is collected with statement 'SHOW STATUS where Variable_name = 'Slow_queries'.

mysql_slow_queries, number of queries that have taken more than X seconds, depending of the MySQL configuration parameter 'long_query_time' (10s per default)

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