After upgrading to 8.0 the alogs show blocks of the following warnings.
Data was ignored when loading data for column [Average CPU Usage] into class: 'Monthly summary' (b73735c6-fca2-4817-af74-fb0c5fa23490)
Average CPU Usage is an Application Metering dataclass and Inv_Monthly_Summary is an Application Metering table. The Application Metering plug-ins were completely rewritten for 8.0 and there are differences in how the data is sent from agents to the database between Application Metering 7.6 and 8.0. If Application Metering plug-ins are not upgraded from 7.6 after the NS is upgraded to 8.0 the discrepancies will cause these warnings.
Upgrade Symantec Management Agents and Application Metering Plug-ins to 8.0.