feat: add the metadata manager to the participants list too

Signed-off-by: Manan Gupta <[email protected]>

go/vt/vtctl/grpcvtctldserver/server.go

@@ -2461,6 +2461,15 @@ func (s *VtctldServer) GetUnresolvedTransactions(ctx context.Context, req *vtctl
 			if err != nil {
 				return err
 			}
+			// The metadata manager is itself not part of the list of participants.
+			// We should it to the list before showing it to the users.
+			for _, trnx := range shardTrnxs {
+				trnx.Participants = append(trnx.Participants, &querypb.Target{
+					Keyspace:   req.Keyspace,
+					Shard:      shard,
+					TabletType: topodatapb.TabletType_PRIMARY,
+				})
+			}
 			mu.Lock()
 			defer mu.Unlock()
 			transactions = append(transactions, shardTrnxs...)

go/vt/vtctl/grpcvtctldserver/server_test.go

@@ -5370,6 +5370,16 @@ func TestExecuteHook(t *testing.T) {
 
 func TestGetUnresolvedTransactions(t *testing.T) {
 	ks := "testkeyspace"
+	shard1Target := &querypb.Target{
+		Keyspace:   ks,
+		Shard:      "-80",
+		TabletType: topodatapb.TabletType_PRIMARY,
+	}
+	shard2Target := &querypb.Target{
+		Keyspace:   ks,
+		Shard:      "80-",
+		TabletType: topodatapb.TabletType_PRIMARY,
+	}
 
 	tests := []struct {
 		name      string
@@ -5382,24 +5392,25 @@ func TestGetUnresolvedTransactions(t *testing.T) {
 			name: "unresolved transaction on both shards",
 			tmc: &testutil.TabletManagerClient{
 				GetUnresolvedTransactionsResults: map[string][]*querypb.TransactionMetadata{
-					"-80": {{Dtid: "aa"}},
-					"80-": {{Dtid: "bb"}},
+					"-80": {{Dtid: "aa", Participants: []*querypb.Target{shard2Target}}},
+					"80-": {{Dtid: "bb", Participants: []*querypb.Target{shard1Target}}},
 				},
 			},
 			keyspace: "testkeyspace",
 			expected: []*querypb.TransactionMetadata{
-				{Dtid: "aa"}, {Dtid: "bb"},
+				{Dtid: "aa", Participants: []*querypb.Target{shard2Target, shard1Target}},
+				{Dtid: "bb", Participants: []*querypb.Target{shard1Target, shard2Target}},
 			},
 		}, {
-			name: "unresolved transaction on one sharda",
+			name: "unresolved transaction on one shard",
 			tmc: &testutil.TabletManagerClient{
 				GetUnresolvedTransactionsResults: map[string][]*querypb.TransactionMetadata{
-					"80-": {{Dtid: "bb"}},
+					"80-": {{Dtid: "bb", Participants: []*querypb.Target{shard1Target}}},
 				},
 			},
 			keyspace: "testkeyspace",
 			expected: []*querypb.TransactionMetadata{
-				{Dtid: "bb"},
+				{Dtid: "bb", Participants: []*querypb.Target{shard1Target, shard2Target}},
 			},
 		},
 		{