Activation of discovered snapshots began. Volume GUID: %1 Guidance: When a volume is brought online or reverted to a snapshot, ...

Activation of discovered snapshots began.

Volume GUID: %1

Guidance:
When a volume is brought online or reverted to a snapshot, the volume snapshot driver scans for and activates any persistent snapshots that may be on the volume.

You should expect this event when a volume is brought online or reverted to a snapshot.  No user action is required.