Create a dashboard in a folder named SPM Dashboard and with the unique name SPM_Contract_Up_Time, to see the View Dashboard link in the SPM configuration screen for this metric.

Create summary reports with charts on SPM - Contract Up Time object, to get the monthly uptime summary for each installed product covered by a service contract.

Grouping and aggregation can be on any of the following attributes:

Apart from Total Up Time as a % of Guaranteed Up Time, Total Down Time During Maintenance is also available OOTB for reporting.