kvflowcontrolpb: rm unused type

Epic: none
Release note: none

pkg/kv/kvserver/kvflowcontrol/kvflowcontrolpb/kvflowcontrol.go

@@ -49,14 +49,6 @@ func (a AdmittedRaftLogEntries) SafeFormat(w redact.SafePrinter, _ rune) {
 		a.RangeID, a.StoreID, admissionpb.WorkPriority(a.AdmissionPriority), a.UpToRaftLogPosition)
 }
 
-func (a AdmittedResponseForRange) String() string {
-	return redact.StringWithoutMarkers(a)
-}
-
-func (a AdmittedResponseForRange) SafeFormat(w redact.SafePrinter, _ rune) {
-	w.Printf("admitted-response (s%s r%s %s)", a.LeaderStoreID, a.RangeID, a.Msg.String())
-}
-
 func (a AdmittedState) String() string {
 	return redact.StringWithoutMarkers(a)
 }

pkg/kv/kvserver/kvflowcontrol/kvflowcontrolpb/kvflowcontrol.proto

@@ -125,28 +125,6 @@ message RaftLogPosition {
   uint64 index = 2;
 }
 
-// AdmittedResponseForRange is only used in RACv2. It contains a MsgAppResp
-// from a follower to a leader, that was generated to advance the admitted
-// vector for that follower, maintained by the leader.
-//
-// TODO(pav-kv): remove this type and use PiggybackedAdmittedState.
-message AdmittedResponseForRange {
-  option (gogoproto.goproto_stringer) = false;
-
-  // LeaderStoreID is used to route the request when this message is received
-  // at the leader node.
-  uint64 leader_store_id = 1 [(gogoproto.customname) = "LeaderStoreID",
-    (gogoproto.casttype) = "github.com/cockroachdb/cockroach/pkg/roachpb.StoreID"];
-
-  // RangeID of the raft group to which the MsgAppResp is directed. Used for
-  // routing at the leader node.
-  int64 range_id = 2 [(gogoproto.customname) = "RangeID",
-    (gogoproto.casttype) = "github.com/cockroachdb/cockroach/pkg/roachpb.RangeID"];
-
-  // Msg is the MsgAppResp containing the admitted vector.
-  raftpb.Message msg = 3 [(gogoproto.nullable) = false];
-}
-
 // AdmittedState communicates a replica's vector of admitted log indices at
 // different priorities to the leader of a range.
 //