Graphite: Backend querying improvements (#111549)

pkg/tests/api/graphite/graphite_test.go

@@ -85,7 +85,7 @@ func TestIntegrationGraphite(t *testing.T) {
 		// nolint:gosec
 		resp, err := http.Post(u, "application/json", buf1)
 		require.NoError(t, err)
-		require.Equal(t, http.StatusInternalServerError, resp.StatusCode)
+		require.Equal(t, http.StatusBadRequest, resp.StatusCode)
 		t.Cleanup(func() {
 			err := resp.Body.Close()
 			require.NoError(t, err)