Panels: Remove value mapping of values that have been formatted #26763 (#30868)

* Panels: Remove value mapping of values that have been formatted

packages/grafana-data/src/field/displayProcessor.test.ts

@@ -164,6 +164,16 @@ describe('Format value', () => {
     expect(instance(value).numeric).toEqual(1);
   });
 
+  it('should not map 1kW to the value for 1W', () => {
+    const valueMappings: ValueMapping[] = [{ id: 0, text: 'mapped', type: MappingType.ValueToText, value: '1' }];
+    const value = '1000';
+    const instance = getDisplayProcessorFromConfig({ decimals: 1, mappings: valueMappings, unit: 'watt' });
+
+    const result = instance(value);
+
+    expect(result.text).toEqual('1.0');
+  });
+
   it('With null value and thresholds should use base color', () => {
     const instance = getDisplayProcessorFromConfig({
       thresholds: {

packages/grafana-data/src/field/displayProcessor.ts

@@ -90,14 +90,6 @@ export function getDisplayProcessor(options?: DisplayProcessorOptions): DisplayP
         text = v.text;
         suffix = v.suffix;
         prefix = v.prefix;
-
-        // Check if the formatted text mapped to a different value
-        if (mappings && mappings.length > 0) {
-          const mappedValue = getMappedValue(mappings, text);
-          if (mappedValue) {
-            text = mappedValue.text;
-          }
-        }
       }
 
       // Return the value along with scale info