Symptoms
Munin reports high MySQL InnoDB free tablespace usage even though it is set to autoextend.
Description
Munin reports high MySQL InnoDB free tablespace usage even though it is set to autoextend, for example:
# mysql -e "SHOW VARIABLES LIKE 'innodb_data_file_path'"
+-----------------------+------------------------+
| Variable_name | Value |
+-----------------------+------------------------+
| innodb_data_file_path | ibdata1:12M:autoextend |
+-----------------------+------------------------+
Workaround
Create file /etc/munin/plugin-conf.d/mysql_innodb with the contents:
[mysql_innodb]
env.warning 0
env.critical 0
Then restart munin
systemctl restart munin-node