The have's user list says why the bus node does not watch the grants part's key (review of the switch, issue 1945)

go/delivery/delivery.go

@@ -361,6 +361,9 @@ type UserListWritten struct {
 	// Key is the bus node's sealing key, its public half as SPKI PEM: the key the grants part seals its list to
 	// (clause 7). Public, as the vault holds it.
 	Key string `json:"key,omitempty"`
+	// Unwatched says why the bus node does not watch the grants part's key now (its watch refused or ended, and tried
+	// again), empty while it does or where it need not (ADR 0547 clause 8): it then keeps the last list it followed.
+	Unwatched string `json:"unwatched,omitempty"`
 	// Handed is the hashes of the users of the list on the machine, sealed to the vault, for its adoption of the
 	// accounts it holds no value for (ADR 0547 clause 9, handed.go); nil while the vault's key is not known.
 	Handed *AccountsHanded `json:"handed,omitempty"`