Dashboard migration: Implement v2 to v0 conversions (#114812)

* Update docs

* Remove 406 response since now it is converted

* fix linter

---------

Co-authored-by: Stephanie Hingtgen <stephanie.hingtgen@grafana.com>

pkg/api/dashboard.go

@@ -96,12 +96,6 @@ func (hs *HTTPServer) GetDashboard(c *contextmodel.ReqContext) response.Response
 		return rsp
 	}
 
-	// v2 is not supported in /api
-	if strings.HasPrefix(dash.APIVersion, "v2") {
-		url := fmt.Sprintf("/apis/dashboard.grafana.app/%s/namespaces/%s/dashboards/%s", dash.APIVersion, hs.namespacer(c.GetOrgID()), dash.UID)
-		return response.Error(http.StatusNotAcceptable, "dashboard api version not supported, use "+url+" instead", nil)
-	}
-
 	var (
 		publicDashboardEnabled = false
 		err                    error

pkg/api/dashboard_test.go

@@ -7,7 +7,6 @@ import (
 	"io"
 	"net/http"
 	"os"
-	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -868,45 +867,6 @@ func TestIntegrationDashboardAPIEndpoint(t *testing.T) {
 			assert.Equal(t, false, dash.Meta.Provisioned)
 		}, mockSQLStore)
 	})
-
-	t.Run("v2 dashboards should not be returned in api", func(t *testing.T) {
-		mockSQLStore := dbtest.NewFakeDB()
-		dashboardService := dashboards.NewFakeDashboardService(t)
-		dashboardProvisioningService := dashboards.NewFakeDashboardProvisioning(t)
-
-		dataValue, err := simplejson.NewJson([]byte(`{"id": 1, "apiVersion": "v2"}`))
-		require.NoError(t, err)
-		qResult := &dashboards.Dashboard{
-			ID:         1,
-			UID:        "dash",
-			OrgID:      1,
-			APIVersion: "v2",
-			Data:       dataValue,
-		}
-		dashboardService.On("GetDashboard", mock.Anything, mock.AnythingOfType("*dashboards.GetDashboardQuery")).Return(qResult, nil)
-
-		loggedInUserScenarioWithRole(t, "When calling GET on", "GET", "/api/dashboards/uid/dash", "/api/dashboards/uid/:uid", org.RoleEditor, func(sc *scenarioContext) {
-			hs := &HTTPServer{
-				Cfg:                          setting.NewCfg(),
-				LibraryElementService:        &libraryelementsfake.LibraryElementService{},
-				SQLStore:                     mockSQLStore,
-				AccessControl:                actest.FakeAccessControl{ExpectedEvaluate: true},
-				DashboardService:             dashboardService,
-				Features:                     featuremgmt.WithFeatures(),
-				starService:                  startest.NewStarServiceFake(),
-				tracer:                       tracing.InitializeTracerForTest(),
-				dashboardProvisioningService: dashboardProvisioningService,
-				folderService:                foldertest.NewFakeService(),
-				log:                          log.New("test"),
-				namespacer:                   func(orgID int64) string { return strconv.FormatInt(orgID, 10) },
-			}
-			hs.callGetDashboard(sc)
-
-			assert.Equal(t, http.StatusNotAcceptable, sc.resp.Code)
-			result := sc.ToJSON()
-			assert.Equal(t, "dashboard api version not supported, use /apis/dashboard.grafana.app/v2/namespaces/1/dashboards/dash instead", result.Get("message").MustString())
-		}, mockSQLStore)
-	})
 }
 
 func TestDashboardVersionsAPIEndpoint(t *testing.T) {