Dashboard Migrations: V2 - legacy services.filter and graphite panel type (#112282)

* migrate to v2

* Fix tests

* graphite panels should be auto-migrated

* lint

* Provisioning: Fix dashboard export to preserve original API version

* Add error handling for the edge case where conversion fails but no
storedVersion is available.

apps/dashboard/pkg/migration/frontend_defaults.go

@@ -946,32 +946,13 @@ func applyPanelAutoMigration(panel map[string]interface{}) {
 	var newType string
 
 	// Graph needs special logic as it can be migrated to multiple panels
-	if panelType == "graph" {
+	// Including graphite which was previously migrated to graph in the schema version 2 migration in DashboardMigrator.ts
+	// but this was a bug because in there graphite was set to graph, but since those migrations run
+	// after PanelModel.restoreModel where autoMigrateFrom is set, this caused the graph migration to be skipped.
+	// And this resulted in a dashboard with invalid panels.
+	if panelType == "graph" || panelType == "graphite" {
 		// Check xaxis mode for special cases
-		if xaxis, ok := panel["xaxis"].(map[string]interface{}); ok {
-			if mode, ok := xaxis["mode"].(string); ok {
-				switch mode {
-				case "series":
-					// Check legend values for bargauge
-					if legend, ok := panel["legend"].(map[string]interface{}); ok {
-						if values, ok := legend["values"].(bool); ok && values {
-							newType = "bargauge"
-						} else {
-							newType = "barchart"
-						}
-					} else {
-						newType = "barchart"
-					}
-				case "histogram":
-					newType = "histogram"
-				}
-			}
-		}
-
-		// Default graph migration to timeseries
-		if newType == "" {
-			newType = "timeseries"
-		}
+		newType = getGraphAutoMigration(panel)
 	} else {
 		// Check autoMigrateAngular mapping
 		autoMigrateAngular := map[string]string{
@@ -995,6 +976,36 @@ func applyPanelAutoMigration(panel map[string]interface{}) {
 	}
 }
 
+func getGraphAutoMigration(panel map[string]interface{}) string {
+	newType := ""
+	if xaxis, ok := panel["xaxis"].(map[string]interface{}); ok {
+		if mode, ok := xaxis["mode"].(string); ok {
+			switch mode {
+			case "series":
+				// Check legend values for bargauge
+				if legend, ok := panel["legend"].(map[string]interface{}); ok {
+					if values, ok := legend["values"].(bool); ok && values {
+						newType = "bargauge"
+					} else {
+						newType = "barchart"
+					}
+				} else {
+					newType = "barchart"
+				}
+			case "histogram":
+				newType = "histogram"
+			}
+		}
+	}
+
+	// Default graph migration to timeseries
+	if newType == "" {
+		newType = "timeseries"
+	}
+
+	return newType
+}
+
 // removeNullValuesRecursively removes null values from nested objects and arrays
 // This matches the frontend's JSON.stringify/parse behavior
 func removeNullValuesRecursively(data interface{}) {