After removing a server from ping monitoring it doesn't automatically reflects on the availability report and shows the stat as 0 achieved.
Release : 9.2.0
Component : UIM NET CONNECT
Bug in 9.2 will be addressed in later 20.3 releases,
workaround :
1. logi to ump
2. go to SLM
3. Select SLA ---then SLO
4. delete the particular qos entry,(verifying src and target)
5. save
6. save sla
7. recalculate