add(telemetry): Add missing telemetry for UserPromptEvent (#6885)

Co-authored-by: Shnatu <snatu@google.com>
Co-authored-by: Arya Gummadi <aryagummadi@google.com>

docs/telemetry.md

@@ -177,9 +177,10 @@ Logs are timestamped records of specific events. The following events are logged
 
 - `gemini_cli.user_prompt`: This event occurs when a user submits a prompt.
   - **Attributes**:
-    - `prompt_length`
-    - `prompt` (this attribute is excluded if `log_prompts_enabled` is configured to be `false`)
-    - `auth_type`
+    - `prompt_length` (int)
+    - `prompt_id` (string)
+    - `prompt` (string, this attribute is excluded if `log_prompts_enabled` is configured to be `false`)
+    - `auth_type` (string)
 
 - `gemini_cli.tool_call`: This event occurs for each function call.
   - **Attributes**:

packages/core/src/telemetry/loggers.test.ts

@@ -208,6 +208,8 @@ describe('loggers', () => {
           'event.timestamp': '2025-01-01T00:00:00.000Z',
           prompt_length: 11,
           prompt: 'test-prompt',
+          prompt_id: 'prompt-id-8',
+          auth_type: 'vertex-ai',
         },
       });
     });
@@ -222,8 +224,9 @@ describe('loggers', () => {
       } as unknown as Config;
       const event = new UserPromptEvent(
         11,
-        'test-prompt',
+        'prompt-id-9',
         AuthType.CLOUD_SHELL,
+        'test-prompt',
       );
 
       logUserPrompt(mockConfig, event);
@@ -236,6 +239,8 @@ describe('loggers', () => {
           'event.name': EVENT_USER_PROMPT,
           'event.timestamp': '2025-01-01T00:00:00.000Z',
           prompt_length: 11,
+          prompt_id: 'prompt-id-9',
+          auth_type: 'cloud-shell',
         },
       });
     });

packages/core/src/telemetry/loggers.ts

@@ -122,8 +122,13 @@ export function logUserPrompt(config: Config, event: UserPromptEvent): void {
     'event.name': EVENT_USER_PROMPT,
     'event.timestamp': new Date().toISOString(),
     prompt_length: event.prompt_length,
+    prompt_id: event.prompt_id,
   };
 
+  if (event.auth_type) {
+    attributes['auth_type'] = event.auth_type;
+  }
+
   if (shouldLogUserPrompts(config)) {
     attributes['prompt'] = event.prompt;
   }