This supplies the operator-assigned name of the encap tunnel group referenced by the notification, giving a human-readable label instead of the bare numeric group index. This matters because encap tunnel groups are typically named for their service or customer (e.g., 'CUST-A-ENCAP'), so seeing the name in an alert immediately tells the NOC which customer service is impacted. A trap showing 'METRO-RING-ENCAP' points staff straight to the metro ring service rather than requiring a lookup table.