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# 33 Upgrade notes for 6.0.23

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## Breaking changes

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#### Agent 2 plugins

##### MySQL

The correct master host is now returned if specified in the `mysql.replication.get_slave_status[]` 
[item](/manual/config/items/itemtypes/zabbix_agent/zabbix_agent2#mysql) "masterHost" parameter. 
Previously the "masterHost" parameter was ignored and always the first master host was returned.

If this parameter is not specified, all hosts are returned. 

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**MySQL plugin parameters**

The following MySQL plugin parameters are no longer mandatory if Plugins.Mysql.Sessions.<SessionName>.TLSConnect is set to *verify_ca* or *verify_full*:

-   Plugins.Mysql.Sessions.<SessionName>.TLSCertFile
-   Plugins.Mysql.Sessions.<SessionName>.TLSKeyFile

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#### PostgreSQL-TimescaleDB combination no longer checked

Zabbix no longer checks for the supported PostgreSQL-TimescaleDB combination. As before, Zabbix does check for the supported PostgreSQL version or TimescaleDB version separately.

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