Transform: Fixed issue in labels to fields and update docs (#27501)

packages/grafana-data/src/transformations/transformers/labelsToFields.test.ts

@@ -50,7 +50,16 @@ describe('Labels as Columns', () => {
       name: 'A',
       fields: [
         { name: 'time', type: FieldType.time, values: [1000, 2000] },
-        { name: 'Value', type: FieldType.number, values: [1, 2], labels: { location: 'inside', name: 'Request' } },
+        {
+          name: 'Value',
+          type: FieldType.number,
+          values: [1, 2],
+          labels: { location: 'inside', name: 'Request' },
+          config: {
+            displayName: 'Custom1',
+            displayNameFromDS: 'Custom2',
+          },
+        },
       ],
     });
 

packages/grafana-data/src/transformations/transformers/labelsToFields.ts

@@ -51,7 +51,9 @@ export const labelsToFieldsTransformer: DataTransformerInfo<LabelsToFieldsOption
           name,
           config: {
             ...field.config,
+            // we need to clear thes for this transform as these can contain label names that we no longer want
             displayName: undefined,
+            displayNameFromDS: undefined,
           },
           labels: undefined,
         });