currently on Summary graph, only "Developers by Open Issues" shows remained issues by developer, but we need to know "Open issues vs time" trending graph to demonstrate the performance of solving problems for each reporter or handler.
Please don't attach the plugin and don't publish it at any other place.
IIRC there are parts in it which are questionable in terms of licensing and must not be published.
I contacted the author some years ago because of that.
Maybe this is the reason, that it's no longer downloadable.
Please use Search before posting and read the Manual