mysql-connections: Add perfdata mysql_max_used_connections

CHANGELOG.md

@@ -72,6 +72,7 @@ Monitoring Plugins:
 * journald-query: Improve output
 * mysql-aria: Remove WARN if `aria_pagecache_read_requests` > 0 and `pct_aria_keys_from_mem` < 95%
 * mysql-connections: Report and warn on current usage instead of peak usage, and improved output.
+* mysql-connections: Add perfdata mysql_max_used_connections
 * mysql-innodb-buffer-pool-size: Improve code and output
 * mysql-logfile: Stop magic auto-configure if `--server-log` is given
 * mysql-logfile: Returns OK instead of UNKNOWN if logfile is found but empty

check-plugins/mysql-connections/README.rst

@@ -96,6 +96,7 @@ Perfdata / Metrics
     mysql_connections,                          Continous Counter,  "Value of the MySQL ``Connections`` status variable. Number of all connection attempts (both successful and unsuccessful)."
     mysql_interactive_timeout,                  Seconds,            "Value of the MySQL ``interactive_timeout`` system variable. Time in seconds that the server waits for an interactive connection (one that connects with the mysql_real_connect() CLIENT_INTERACTIVE option) to become active before closing it."
     mysql_max_connections,                      Number,             "Value of the MySQL ``max_connections`` system variable. The maximum number of simultaneous client connections."
+    mysql_max_used_connections,                 Number,             ""Value of the MySQL ``Max_used_connections`` status variable. Max number of connections ever open at the same time."
     mysql_pct_connections_aborted,              Percentage,         Aborted_connects / Connections \* 100
     mysql_pct_connections_used,                 Percentage,         Threads_connected / max_connections \* 100
     mysql_threads_connected,                    None,               "Value of the MySQL ``Threads_connected`` status variable. Number of clients connected to the server. Is inaccurate when the thread pool is in use, since each client connection does not correspond to a dedicated thread in that case."

check-plugins/mysql-connections/mysql-connections

@@ -22,7 +22,7 @@ from lib.globals import (STATE_OK, STATE_UNKNOWN,  # pylint: disable=C0413
                           STATE_WARN)
 
 __author__ = 'Linuxfabrik GmbH, Zurich/Switzerland'
-__version__ = '2023100902'
+__version__ = '2023102601'
 
 DESCRIPTION = """Checks the connection usage rate, the rate of aborted connections and
                  if name resolution is active for new connections on MySQL/MariaDB."""
@@ -217,6 +217,7 @@ def main():
 
     perfdata += lib.base.get_perfdata('mysql_aborted_connects', mystat['Aborted_connects'], 'c', None, None, 0, None)
     perfdata += lib.base.get_perfdata('mysql_connections', mystat['Connections'], 'c', None, None, 0, None)
+    perfdata += lib.base.get_perfdata('mysql_max_used_connections', mystat['Max_used_connections'], None, None, None, 0, None)
     perfdata += lib.base.get_perfdata('mysql_threads_connected', mystat['Threads_connected'], None, None, None, 0, None)
     perfdata += lib.base.get_perfdata('mysql_threads_running', mystat['Threads_running'], None, None, None, 0, None)