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diff --git a/‎src/client/common/persistentState.ts
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+1-1Lines changed: 1 addition & 1 deletion b/‎src/client/common/persistentState.ts
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diff --git a/‎src/client/extension.ts
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diff --git a/‎src/client/telemetry/constants.ts
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diff --git a/‎src/client/telemetry/index.ts
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@@ -108,7 +108,7 @@ export class PersistentState<T> implements IPersistentState<T> {
 export const GLOBAL_PERSISTENT_KEYS_DEPRECATED = 'PYTHON_EXTENSION_GLOBAL_STORAGE_KEYS';
 export const WORKSPACE_PERSISTENT_KEYS_DEPRECATED = 'PYTHON_EXTENSION_WORKSPACE_STORAGE_KEYS';
 
-const GLOBAL_PERSISTENT_KEYS = 'PYTHON_GLOBAL_STORAGE_KEYS';
+export const GLOBAL_PERSISTENT_KEYS = 'PYTHON_GLOBAL_STORAGE_KEYS';
 const WORKSPACE_PERSISTENT_KEYS = 'PYTHON_WORKSPACE_STORAGE_KEYS';
 type KeysStorageType = 'global' | 'workspace';
 export type KeysStorage = { key: string; defaultValue: unknown };
 
@@ -46,6 +46,7 @@ import { WorkspaceService } from './common/application/workspace';
 import { disposeAll } from './common/utils/resourceLifecycle';
 import { ProposedExtensionAPI } from './proposedApiTypes';
 import { buildProposedApi } from './proposedApi';
+import { GLOBAL_PERSISTENT_KEYS } from './common/persistentState';
 
 durations.codeLoadingTime = stopWatch.elapsedTime;
 
@@ -116,6 +117,8 @@ async function activateUnsafe(
     // activation starts here
 
     // First we initialize.
+    const isFirstSession = context.globalState.get(GLOBAL_PERSISTENT_KEYS, []).length === 0;
+    console.log(isFirstSession);
     const ext = initializeGlobals(context);
     activatedServiceContainer = ext.legacyIOC.serviceContainer;
     // Note standard utils especially experiment and platform code are fundamental to the extension
 
@@ -7,6 +7,7 @@ export enum EventName {
     FORMAT_ON_TYPE = 'FORMAT.FORMAT_ON_TYPE',
     EDITOR_LOAD = 'EDITOR.LOAD',
     REPL = 'REPL',
+    FIRST_SESSION = 'FIRST_SESSION',
     CREATE_NEW_FILE_COMMAND = 'CREATE_NEW_FILE_COMMAND',
     SELECT_INTERPRETER = 'SELECT_INTERPRETER',
     SELECT_INTERPRETER_ENTER_BUTTON = 'SELECT_INTERPRETER_ENTER_BUTTON',
 
@@ -1440,6 +1440,15 @@ export interface IEventNamePropertyMapping {
          */
         selection: 'Yes' | 'Maybe later' | "Don't show again" | undefined;
     };
+    /**
+     * Telemetry event sent in the very first session of the user. We check whether persistent cache is empty to figure out if it's the first session.
+     */
+    /* __GDPR__
+       "first_session" : {
+           "duration" : { "classification": "SystemMetaData", "purpose": "FeatureInsight", "isMeasurement": true, "owner": "karrtikr" }
+       }
+     */
+    [EventName.FIRST_SESSION]: never | undefined;
     /**
      * Telemetry event sent when starting REPL
      */