rfc,

This is not a bug or feature request for MantisBT (you are asking for help on how develop a plugin). I am therefore resolving this issue as "no change required".

Please use the forums to get support on customizing and using MantisBT (refer to http://www.mantisbt.org/support.php for links and further details).

There is nothing more to tell at this place than what was been told in 0024983 and 0010211.

The mentioned plugin 0010211:0041100 (didn't have a deepr look) might be a good starting point for a KPI plugin.

To understand the general concepts of plugin development, read https://www.mantisbt.org/docs/master/en-US/Developers_Guide/html-desktop/#dev.plugins