fix: emit acceptedLineCount metric and AgenticCodeAccepted interaction type (aws#2167)

Author: tsmithsz

server/aws-lsp-codewhisperer/src/language-server/agenticChat/agenticChatController.ts

@@ -2076,6 +2076,19 @@ export class AgenticChatController implements ChatHandlers {
                             this.#abTestingAllocation?.experimentName,
                             this.#abTestingAllocation?.userVariation
                         )
+                        // Emit acceptedLineCount when write tool is used and code changes are accepted
+                        const beforeLines = cachedToolUse?.fileChange?.before?.split('\n').length ?? 0
+                        const afterLines = doc?.getText()?.split('\n').length ?? 0
+                        const acceptedLineCount = afterLines - beforeLines
+                        await this.#telemetryController.emitInteractWithMessageMetric(
+                            tabId,
+                            {
+                                cwsprChatMessageId: chatResult.messageId ?? toolUse.toolUseId,
+                                cwsprChatInteractionType: ChatInteractionType.AgenticCodeAccepted,
+                                codewhispererCustomizationArn: this.#customizationArn,
+                            },
+                            acceptedLineCount
+                        )
                         await chatResultStream.writeResultBlock(chatResult)
                         break
                     case CodeReview.toolName:

server/aws-lsp-codewhisperer/src/language-server/chat/telemetry/chatTelemetryController.ts

@@ -421,10 +421,12 @@ export class ChatTelemetryController {
 
     public emitInteractWithMessageMetric(
         tabId: string,
-        metric: Omit<InteractWithMessageEvent, 'cwsprChatConversationId'>
+        metric: Omit<InteractWithMessageEvent, 'cwsprChatConversationId'>,
+        acceptedLineCount?: number
     ) {
         return this.#telemetryService.emitChatInteractWithMessage(metric, {
             conversationId: this.getConversationId(tabId),
+            acceptedLineCount,
         })
     }
 

server/aws-lsp-codewhisperer/src/shared/telemetry/telemetryService.ts

@@ -66,6 +66,7 @@ export class TelemetryService {
         [ChatInteractionType.Upvote]: 'UPVOTE',
         [ChatInteractionType.Downvote]: 'DOWNVOTE',
         [ChatInteractionType.ClickBodyLink]: 'CLICK_BODY_LINK',
+        [ChatInteractionType.AgenticCodeAccepted]: 'AGENTIC_CODE_ACCEPTED',
     }
 
     constructor(

server/aws-lsp-codewhisperer/src/shared/telemetry/types.ts

@@ -429,6 +429,7 @@ export enum ChatInteractionType {
     Upvote = 'upvote',
     Downvote = 'downvote',
     ClickBodyLink = 'clickBodyLink',
+    AgenticCodeAccepted = 'agenticCodeAccepted',
 }
 
 export enum ChatHistoryActionType {