This was

It checks some aspects of Db2, from a primitive perspective.
This script was not written by a dba, and it does not have the view from the administrative aspect of db2.
The code still have parts from Oracle, so this is not focused in Db2, but like porting.
The script does not support HADR, a minimum for a production environment.
It does not reuses connection, and it can be aggressive when monitoring multiple aspects.
The documentation does not include what grants or permissions are necessary to make it work.
It has a SQL replication part, that could be handy, it is not widely used. Instead, the script lacks mechanism to monitor other elements of Db2.