The state of the upgrading node.
Possible values are:
Invalid- Indicates the upgrade state is invalid. All Service Fabric enumerations have the invalid type. The value is zero.
PreUpgradeSafetyCheck- The upgrade has not started yet due to pending safety checks. The value is 1
Upgrading- The upgrade is in progress. The value is 2
PostUpgradeSafetyCheck- The upgrade has completed and post upgrade safety checks are being performed. The value is 3