StatPanels: Fixed migration from old singlestat and default min & max being…

StatPanels: Fixed migration from old singlestat and default min & max being copied even when gauge was disbled (#21820)

packages/grafana-ui/src/components/SingleStatShared/SingleStatBaseOptions.ts

@@ -86,7 +86,7 @@ export function sharedSingleStatPanelChangedHandler(
       defaults.mappings = mappings;
       defaults.mappings = mappings;
     }
     }
 
 
-    if (panel.gauge) {
+    if (panel.gauge && panel.gauge.show) {
       defaults.min = panel.gauge.minValue;
       defaults.min = panel.gauge.minValue;
       defaults.max = panel.gauge.maxValue;
       defaults.max = panel.gauge.maxValue;
     }
     }

public/app/plugins/panel/gauge/GaugeMigrations.test.ts

@@ -103,4 +103,23 @@ describe('Gauge Panel Migrations', () => {
     expect(newOptions.showThresholdMarkers).toBe(true);
     expect(newOptions.showThresholdMarkers).toBe(true);
     expect(newOptions.showThresholdLabels).toBe(true);
     expect(newOptions.showThresholdLabels).toBe(true);
   });
   });
+
+  it('change from angular singlestatt with no enabled gauge', () => {
+    const old: any = {
+      angular: {
+        format: 'ms',
+        decimals: 7,
+        gauge: {
+          maxValue: 150,
+          minValue: -10,
+          show: false,
+        },
+      },
+    };
+
+    const newOptions = gaugePanelChangedHandler({} as any, 'singlestat', old);
+    expect(newOptions.fieldOptions.defaults.unit).toBe('ms');
+    expect(newOptions.fieldOptions.defaults.min).toBe(undefined);
+    expect(newOptions.fieldOptions.defaults.max).toBe(undefined);
+  });
 });
 });