Re: HI status = worst event assigned to it (like in OM)
this is not correct. The unassigned/unresolved KPIs will display the status of the worst open event assigned to the CI.
if your event will have ETI to impact HI, then the last event will control the HI status. if you will send "SubCiHint" with your events, to impact the same HI (for example: CPU Load HI, but with SubCIHint=CPU1 and CPU2) then the HI Status will be the worst of all SubCiHints and each is calculated individually (so for example if CPU1 got clear event and CPU2 is still Critical, then the HI will show Critical).