fix: special handling of unmarshalling for invalid json dashboards (#108519)

* implement special dashboard fallback logic when dashboard data has invalid json behind feature flag

---------

Co-authored-by: Will Assis <william@williamassis.com>

pkg/services/featuremgmt/registry.go

@@ -501,6 +501,12 @@ var (
 			Stage:       FeatureStageExperimental,
 			Owner:       grafanaAppPlatformSquad,
 		},
+		{
+			Name:        "scanRowInvalidDashboardParseFallbackEnabled",
+			Description: "Enable fallback parsing behavior when scan row encounters invalid dashboard JSON",
+			Stage:       FeatureStageExperimental,
+			Owner:       grafanaSearchAndStorageSquad,
+		},
 		{
 			Name:            "datasourceQueryTypes",
 			Description:     "Show query type endpoints in datasource API servers (currently hardcoded for testdata, expressions, and prometheus)",

pkg/services/featuremgmt/toggles_gen.csv

@@ -65,6 +65,7 @@ kubernetesDashboards,experimental,@grafana/grafana-app-platform-squad,false,fals
 dashboardDisableSchemaValidationV1,experimental,@grafana/grafana-app-platform-squad,false,false,false
 dashboardDisableSchemaValidationV2,experimental,@grafana/grafana-app-platform-squad,false,false,false
 dashboardSchemaValidationLogging,experimental,@grafana/grafana-app-platform-squad,false,false,false
+scanRowInvalidDashboardParseFallbackEnabled,experimental,@grafana/search-and-storage,false,false,false
 datasourceQueryTypes,experimental,@grafana/grafana-app-platform-squad,false,true,false
 queryService,experimental,@grafana/grafana-datasources-core-services,false,true,false
 queryServiceRewrite,experimental,@grafana/grafana-datasources-core-services,false,true,false

pkg/services/featuremgmt/toggles_gen.go

@@ -271,6 +271,10 @@ const (
 	// Log schema validation errors so they can be analyzed later
 	FlagDashboardSchemaValidationLogging = "dashboardSchemaValidationLogging"
 
+	// FlagScanRowInvalidDashboardParseFallbackEnabled
+	// Enable fallback parsing behavior when scan row encounters invalid dashboard JSON
+	FlagScanRowInvalidDashboardParseFallbackEnabled = "scanRowInvalidDashboardParseFallbackEnabled"
+
 	// FlagDatasourceQueryTypes
 	// Show query type endpoints in datasource API servers (currently hardcoded for testdata, expressions, and prometheus)
 	FlagDatasourceQueryTypes = "datasourceQueryTypes"

pkg/services/featuremgmt/toggles_gen.json

@@ -2760,6 +2760,18 @@
         "codeowner": "@grafana/identity-access-team"
       }
     },
+    {
+      "metadata": {
+        "name": "scanRowInvalidDashboardParseFallbackEnabled",
+        "resourceVersion": "1753730899886",
+        "creationTimestamp": "2025-07-28T19:28:19Z"
+      },
+      "spec": {
+        "description": "Enable fallback parsing behavior when scan row encounters invalid dashboard JSON",
+        "stage": "experimental",
+        "codeowner": "@grafana/search-and-storage"
+      }
+    },
     {
       "metadata": {
         "name": "scopeApi",