Transformations: Deduplicate names when using extract fields transformation. (#77569)

* dedupe field names

* add test to make sure we don't break normal case

pkg/services/featuremgmt/registry.go

@@ -960,5 +960,12 @@ var (
 			RequiresDevMode: false,
 			Owner:           grafanaAuthnzSquad,
 		},
+		{
+			Name:         "extractFieldsNameDeduplication",
+			Description:  "Make sure extracted field names are unique in the dataframe",
+			Stage:        FeatureStageExperimental,
+			FrontendOnly: true,
+			Owner:        grafanaBiSquad,
+		},
 	}
 )

pkg/services/featuremgmt/toggles_gen.csv

@@ -136,3 +136,4 @@ alertmanagerRemoteSecondary,experimental,@grafana/alerting-squad,false,false,fal
 alertmanagerRemotePrimary,experimental,@grafana/alerting-squad,false,false,false,false
 alertmanagerRemoteOnly,experimental,@grafana/alerting-squad,false,false,false,false
 annotationPermissionUpdate,experimental,@grafana/grafana-authnz-team,false,false,false,false
+extractFieldsNameDeduplication,experimental,@grafana/grafana-bi-squad,false,false,false,true

pkg/services/featuremgmt/toggles_gen.go

@@ -554,4 +554,8 @@ const (
 	// FlagAnnotationPermissionUpdate
 	// Separate annotation permissions from dashboard permissions to allow for more granular control.
 	FlagAnnotationPermissionUpdate = "annotationPermissionUpdate"
+
+	// FlagExtractFieldsNameDeduplication
+	// Make sure extracted field names are unique in the dataframe
+	FlagExtractFieldsNameDeduplication = "extractFieldsNameDeduplication"
 )