Fix experiment telemetry related to optInto/optOutFrom settings (microsoft#22241)

cc/ @luabud

Author: Kartik Raj

src/client/common/experiments/service.ts

@@ -257,8 +257,10 @@ function sendOptInOptOutTelemetry(optedIn: string[], optedOut: string[], package
     const sanitizedOptedIn = optedIn.filter((exp) => optedInEnumValues.includes(exp));
     const sanitizedOptedOut = optedOut.filter((exp) => optedOutEnumValues.includes(exp));
 
+    JSON.stringify(sanitizedOptedIn.sort());
+
     sendTelemetryEvent(EventName.PYTHON_EXPERIMENTS_OPT_IN_OPT_OUT_SETTINGS, undefined, {
-        optedInto: sanitizedOptedIn,
-        optedOutFrom: sanitizedOptedOut,
+        optedInto: JSON.stringify(sanitizedOptedIn.sort()),
+        optedOutFrom: JSON.stringify(sanitizedOptedOut.sort()),
     });
 }

src/client/telemetry/index.ts

@@ -1405,14 +1405,14 @@ export interface IEventNamePropertyMapping {
     [EventName.PYTHON_EXPERIMENTS_OPT_IN_OPT_OUT_SETTINGS]: {
         /**
          * List of valid experiments in the python.experiments.optInto setting
-         * @type {string[]}
+         * @type {string}
          */
-        optedInto: string[];
+        optedInto: string;
         /**
          * List of valid experiments in the python.experiments.optOutFrom setting
-         * @type {string[]}
+         * @type {string}
          */
-        optedOutFrom: string[];
+        optedOutFrom: string;
     };
     /**
      * Telemetry event sent when LS is started for workspace (workspace folder in case of multi-root)

src/test/common/experiments/service.unit.test.ts

@@ -491,7 +491,10 @@ suite('Experimentation service', () => {
             await experimentService.activate();
 
             const { properties } = telemetryEvents[1];
-            assert.deepStrictEqual(properties, { optedInto: ['foo'], optedOutFrom: ['bar'] });
+            assert.deepStrictEqual(properties, {
+                optedInto: JSON.stringify(['foo']),
+                optedOutFrom: JSON.stringify(['bar']),
+            });
         });
 
         test('Set telemetry properties to empty arrays if no experiments have been opted into or out from', async () => {
@@ -523,7 +526,7 @@ suite('Experimentation service', () => {
             await experimentService.activate();
 
             const { properties } = telemetryEvents[1];
-            assert.deepStrictEqual(properties, { optedInto: [], optedOutFrom: [] });
+            assert.deepStrictEqual(properties, { optedInto: '[]', optedOutFrom: '[]' });
         });
 
         test('If the entered value for a setting contains "All", do not expand it to be a list of all experiments, and pass it as-is', async () => {
@@ -555,7 +558,10 @@ suite('Experimentation service', () => {
             await experimentService.activate();
 
             const { properties } = telemetryEvents[0];
-            assert.deepStrictEqual(properties, { optedInto: ['All'], optedOutFrom: ['All'] });
+            assert.deepStrictEqual(properties, {
+                optedInto: JSON.stringify(['All']),
+                optedOutFrom: JSON.stringify(['All']),
+            });
         });
 
         // This is an unlikely scenario.
@@ -577,7 +583,7 @@ suite('Experimentation service', () => {
             await experimentService.activate();
 
             const { properties } = telemetryEvents[1];
-            assert.deepStrictEqual(properties, { optedInto: [], optedOutFrom: [] });
+            assert.deepStrictEqual(properties, { optedInto: '[]', optedOutFrom: '[]' });
         });
 
         // This is also an unlikely scenario.
@@ -608,7 +614,7 @@ suite('Experimentation service', () => {
             await experimentService.activate();
 
             const { properties } = telemetryEvents[1];
-            assert.deepStrictEqual(properties, { optedInto: [], optedOutFrom: [] });
+            assert.deepStrictEqual(properties, { optedInto: '[]', optedOutFrom: '[]' });
         });
     });
 });