ID: 15549 Title: Crash: mssql_blocked_sessions using pre-1.6 MSSQL agent plugin Component: Checks & agents Level: 1 Class: Bug fix Version: 2.2.0p5 When using a pre-1.6 MSSQL agent plugin the {{mssql_blocked_sessions}} check plugins would crash during discovery. The pre-1.6 MSSQL agent plugins are now deprecated and can no longer be used. Old still existing services will go to {{UNKNOWN}} and encourage you to update to a newer agent plugin version. After a rediscovery the old services will vanish and new services will not be discovered. Therefore an upgrade as described in <a href="https://checkmk.com/de/werk/6140">Werk #6140</a> is necessary.