Schema: convert dashboards from v1beta1 to v2beta1 (#109037)

- Implement full conversion pipeline from v1beta1 → v2beta1
- Ensure frontend–backend parity for all dashboard serialization paths
- Add automatic data loss detection for conversions (panels, queries, annotations, links, variables)
- Extract atomic conversion functions for v0 → v1beta1 → v2alpha1 → v2beta1
- Introduce conversion metrics and detailed logging for loss tracking
- Normalize datasource resolution, defaults, and annotation processing
- Improve panel layout serialization and y-coordinate normalization
- Fix inconsistencies in nested panels and collapsed row behavior
- Refine variable handling:
  - Filter refId from variable query specs
  - Default variable refresh to 'never' (matches frontend)
  - Fix constant and interval variable handling for missing queries
- Unify schema defaults (enable, hide, iconColor, editable, liveNow)
- Fix pluginId usage (UID vs type) and datasource references
- Fix metrics.go bug swallowing errors (return nil → return err)
- Add tests for version-specific conversion error handling
- Add data loss detection tests using source/target version comparison
- Clean up lint issues, legacy code, and redundant files
- Update OpenAPI snapshots and migrated dashboards
- Improve backend migrator to reuse datasource provider and match frontend logic

Co-authored-by: Haris Rozajac <haris.rozajac12@gmail.com>
Co-authored-by: Oscar Kilhed <oscar.kilhed@grafana.com>
Co-authored-by: Stephanie Hingtgen <stephanie.hingtgen@grafana.com>

apps/dashboard/pkg/migration/testutil/mocks.go

@@ -88,6 +88,30 @@ func (p *ConfigurableDataSourceProvider) getStandardTestDataSources() []schemave
 			Name:       "-- Mixed --",
 			ID:         6,
 		},
+		{
+			Default:    false,
+			UID:        "influx-uid",
+			Type:       "influxdb",
+			APIVersion: "v1",
+			Name:       "InfluxDB Test Datasource",
+			ID:         7,
+		},
+		{
+			Default:    false,
+			UID:        "cloudwatch-uid",
+			Type:       "cloudwatch",
+			APIVersion: "v1",
+			Name:       "CloudWatch Test Datasource",
+			ID:         8,
+		},
+		{
+			Default:    false,
+			UID:        "-- Grafana --",
+			Type:       "grafana",
+			APIVersion: "v1",
+			Name:       "-- Grafana --",
+			ID:         9,
+		},
 	}
 }
 

apps/dashboard/pkg/migration/testutil/mocks_test.go

@@ -15,7 +15,7 @@ func TestConfigurableDataSourceProvider(t *testing.T) {
 		provider := NewDataSourceProvider(StandardTestConfig)
 		dataSources := provider.GetDataSourceInfo(ctx)
 
-		require.Len(t, dataSources, 6)
+		require.Len(t, dataSources, 9)
 
 		// Verify standard test configuration
 		defaultDS := dataSources[0]
@@ -58,8 +58,8 @@ func TestConfigurableDataSourceProvider(t *testing.T) {
 		devDS1 := devProvider1.GetDataSourceInfo(ctx)
 		devDS2 := devProvider2.GetDataSourceInfo(ctx)
 
-		require.Len(t, standardDS1, 6)
-		require.Len(t, standardDS2, 6)
+		require.Len(t, standardDS1, 9)
+		require.Len(t, standardDS2, 9)
 		require.Len(t, devDS1, 6)
 		require.Len(t, devDS2, 6)
 
@@ -74,7 +74,7 @@ func TestConfigurableDataSourceProvider(t *testing.T) {
 		provider := NewDataSourceProvider("unknown-config")
 		dataSources := provider.GetDataSourceInfo(ctx)
 
-		require.Len(t, dataSources, 6)
+		require.Len(t, dataSources, 9)
 
 		// Should default to standard configuration
 		defaultDS := dataSources[0]