Fix BenchmarkDistributor_Push benchmark (#6309)

Signed-off-by: SungJin1212 <[email protected]>

pkg/distributor/distributor_test.go

@@ -2209,7 +2209,7 @@ func BenchmarkDistributor_Push(b *testing.B) {
 			require.NoError(b, err)
 
 			// Start the distributor.
-			distributor, err := New(distributorCfg, clientConfig, overrides, ingestersRing, true, nil, log.NewNopLogger())
+			distributor, err := New(distributorCfg, clientConfig, overrides, ingestersRing, true, prometheus.NewRegistry(), log.NewNopLogger())
 			require.NoError(b, err)
 			require.NoError(b, services.StartAndAwaitRunning(context.Background(), distributor))
 
@@ -3315,6 +3315,10 @@ func (i *noopIngester) Close() error {
 	return nil
 }
 
+func (i *noopIngester) PushPreAlloc(ctx context.Context, in *cortexpb.PreallocWriteRequest, opts ...grpc.CallOption) (*cortexpb.WriteResponse, error) {
+	return nil, nil
+}
+
 func (i *noopIngester) Push(ctx context.Context, req *cortexpb.WriteRequest, opts ...grpc.CallOption) (*cortexpb.WriteResponse, error) {
 	return nil, nil
 }