Tempo: Fix validation of float durations (#41400)

* Fix parsing of float numbers in validation

* Adjust test

* Update packages/grafana-data/src/datetime/durationutil.test.ts

* Update packages/grafana-data/src/datetime/durationutil.test.ts

* Remove us from placeholder

packages/grafana-data/src/datetime/durationutil.test.ts

@@ -45,9 +45,19 @@ describe('Duration util', () => {
       expect(isValidGoDuration(durationString)).toEqual(true);
     });
 
+    it('valid float number duration string returns true', () => {
+      const durationString = '3.1h 4.0m 0.1s 2.11ms 0.03us 5.3333ns';
+      expect(isValidGoDuration(durationString)).toEqual(true);
+    });
+
     it('invalid duration string returns false', () => {
       const durationString = '3M 6v 5b 4m';
       expect(isValidGoDuration(durationString)).toEqual(false);
     });
+
+    it('invalid float number duration string returns false', () => {
+      const durationString = '3.h -4.0m 0.s 2.ms -0.us 5.ns';
+      expect(isValidGoDuration(durationString)).toEqual(false);
+    });
   });
 });

packages/grafana-data/src/datetime/durationutil.ts

@@ -124,7 +124,7 @@ export function isValidDuration(durationString: string): boolean {
 export function isValidGoDuration(durationString: string): boolean {
   const timeUnits = ['h', 'm', 's', 'ms', 'us', 'µs', 'ns'];
   for (const value of durationString.trim().split(' ')) {
-    const match = value.match(/(\d+)(.+)/);
+    const match = value.match(/([0-9]*[.]?[0-9]+)(.+)/);
     if (match === null || match.length !== 3) {
       return false;
     }

public/app/plugins/datasource/tempo/NativeSearch.tsx

@@ -33,7 +33,7 @@ interface Props {
 }
 
 const PRISM_LANGUAGE = 'tempo';
-const durationPlaceholder = 'e.g. 1.2s, 100ms, 500us';
+const durationPlaceholder = 'e.g. 1.2s, 100ms';
 const plugins = [
   BracesPlugin(),
   SlatePrism({