When an outage occurs on an UIMHost model, it is not computed in the availability report.
The reason behind this behavior is because of the Event Processing Filter located in $SPECROOT/tomcat/webapps/spectrum/WEB-INF/repmgr/config/availability-up-down.xml file does not have the up and down events generated by the spectrumgtw probe.
CA Spectrum 10.2.1 and CA UIM 8.51
This issue has been addressed in the following patches. Please contact CA Spectrum support: