I'm currently noticing the same issue with an upgrade as Jan. As suggested by Don, in the log file, failure is coming back with:
' ERROR: MEMConfigMigration - Migration has failed.
...SmartGroup_BlueprintDefaultSmartGroup
...Scheduler_HealthAttestationSample
...GettingStartedOverride_MigrateSecureApps
...DeviceProfileSettingValue_AddEnableDevicePasscodePolicy
...SystemCodeOverride_OverrideCIMDEndPoint
...SystemCodeOverride_OverrideHeartBeatSample
An error occurred while the batch was being executed.
Updating database (Failed)
*** Could not deploy package.
Warning SQL72015: The column [eventLog].[DeviceInformationEventType].[DeviceEventTypeID] is being dropped, data loss could occur.
Warning SQL72015: The column [eventLog].[DeviceInteractionEventType].[DeviceEventTypeID] is being dropped, data loss could occur.
Warning SQL72015: The column [mobileManagement].[AAProxyAppMapping].[InternalApplicationID] is being dropped, data loss could occur.
Warning SQL72015: The column [mobileManagement].[AAProxyAppMapping].[RecommendedExternalApplicationID] is being dropped, data loss could occur.
Warning SQL72015: The column [scheduler].[ServiceHealthHistory].[RoutineInstanceName] is being dropped, data loss could occur.
Warning SQL72015: The column [scheduler].[ServiceHealthHistory].[RoutineName] is being dropped, data loss could occur.
Warning SQL72015: The column [scheduler].[ServiceHealthHistory].[RoutineStateCode] is being dropped, data loss could occur.
Warning SQL72015: The column [scheduler].[ServiceHealthHistory].[ServiceInstanceName] is being dropped, data loss could occur.
Warning SQL72015: The column [scheduler].[ServiceHealthHistory].[ServiceStateCode] is being dropped, data loss could occur.
Error SQL72014: .Net SqlClient Data Provider: Msg 50000, Level 16, State 13, Procedure MEMConfigMigration, Line 296 String or binary data would be truncated.
Error SQL72045: Script execution error. The executed script:
PRINT 'Begin Post-Deployment Script...';'
We are on SQL 2012.