Overall health report
This report is a calculation that calculates the days of over or under run of the time it should have taken to resolve an issue. The calculation is as follows:
A = Due date - Creation Date
B = Resolution Date - Creation Date
C = ((B - A) / A) * 100% (=Health indicatior)

Should be possibility choose Project (Filter), Period and Priorities

This calculation will thread a 1 day overrun on a "Blocker" as worse than 1 day overrun on "Critical" etcetera. C can therefore have the following values:
<0% - Issues is solved before planning
=0% - Issue is solved right on planning
>0% - Issue is behind planning
In an healthy situation Health should be in most cases <0 meaning we deliver constantly in time.