TestData: support dropping points from random walk data and send interval (#44683)

packages/grafana-e2e-selectors/src/selectors/components.ts

@@ -33,6 +33,7 @@ export const Components = {
         seriesCount: 'TestData series count',
         spread: 'TestData spread',
         startValue: 'TestData start value',
+        drop: 'TestData drop values',
       },
     },
     DataSourceHttpSettings: {

pkg/tsdb/testdatasource/scenarios.go

@@ -630,6 +630,7 @@ func RandomWalk(query backend.DataQuery, model *simplejson.Json, index int) *dat
 	startValue := model.Get("startValue").MustFloat64(rand.Float64() * 100)
 	spread := model.Get("spread").MustFloat64(1)
 	noise := model.Get("noise").MustFloat64(0)
+	drop := model.Get("drop").MustFloat64(0) / 100.0 // value is 0-100
 
 	min, err := model.Get("min").Float64()
 	hasMin := err == nil
@@ -654,16 +655,23 @@ func RandomWalk(query backend.DataQuery, model *simplejson.Json, index int) *dat
 			walker = max
 		}
 
-		t := time.Unix(timeWalkerMs/int64(1e+3), (timeWalkerMs%int64(1e+3))*int64(1e+6))
-		timeVec = append(timeVec, &t)
-		floatVec = append(floatVec, &nextValue)
+		if drop > 0 && rand.Float64() < drop {
+			// skip value
+		} else {
+			t := time.Unix(timeWalkerMs/int64(1e+3), (timeWalkerMs%int64(1e+3))*int64(1e+6))
+			timeVec = append(timeVec, &t)
+			floatVec = append(floatVec, &nextValue)
+		}
 
 		walker += (rand.Float64() - 0.5) * spread
 		timeWalkerMs += query.Interval.Milliseconds()
 	}
 
 	return data.NewFrame("",
-		data.NewField("time", nil, timeVec),
+		data.NewField("time", nil, timeVec).
+			SetConfig(&data.FieldConfig{
+				Interval: float64(query.Interval.Milliseconds()),
+			}),
 		data.NewField(frameNameForQuery(query, model, index), parseLabels(model), floatVec),
 	)
 }

public/app/plugins/datasource/testdata/components/RandomWalkEditor.tsx

@@ -7,22 +7,31 @@ import { TestDataQuery } from '../types';
 const randomWalkFields = [
   { label: 'Series count', id: 'seriesCount', placeholder: '1', min: 1, step: 1 },
   { label: 'Start value', id: 'startValue', placeholder: 'auto', step: 1 },
-  { label: 'Spread', id: 'spread', placeholder: '1', min: 0.5, step: 0.1 },
-  { label: 'Noise', id: 'noise', placeholder: '0', min: 0, step: 0.1 },
   { label: 'Min', id: 'min', placeholder: 'none', step: 0.1 },
   { label: 'Max', id: 'max', placeholder: 'none', step: 0.1 },
+  { label: 'Spread', id: 'spread', placeholder: '1', min: 0.5, step: 0.1 },
+  { label: 'Noise', id: 'noise', placeholder: '0', min: 0, step: 0.1 },
+  {
+    label: 'Drop (%)',
+    id: 'drop',
+    placeholder: '0',
+    min: 0,
+    max: 100,
+    step: 1,
+    tooltip: 'Exclude some percent (chance) points',
+  },
 ];
 
 const testSelectors = selectors.components.DataSource.TestData.QueryTab;
-type Selector = 'max' | 'min' | 'noise' | 'seriesCount' | 'spread' | 'startValue';
+type Selector = 'max' | 'min' | 'noise' | 'seriesCount' | 'spread' | 'startValue' | 'drop';
 
 export const RandomWalkEditor = ({ onChange, query }: EditorProps) => {
   return (
     <InlineFieldRow>
-      {randomWalkFields.map(({ label, id, min, step, placeholder }) => {
+      {randomWalkFields.map(({ label, id, min, step, placeholder, tooltip }) => {
         const selector = testSelectors?.[id as Selector];
         return (
-          <InlineField label={label} labelWidth={14} key={id} aria-label={selector}>
+          <InlineField label={label} labelWidth={14} key={id} aria-label={selector} tooltip={tooltip}>
             <Input
               width={32}
               name={id}