Add aggregate image metadata to Copilot telemetry#317785
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Pull request overview
This PR adds a shared helper to compute non-restricted, aggregate image metadata and attaches those measurements to Copilot telemetry for chat responses and Auto mode router events, enabling analysis of vision usage without sending image content.
Changes:
- Introduces a shared
imageTelemetryutility to compute aggregate image counts/bytes/MIME-family/source-category measurements. - Adds image measurements to chat response telemetry (
response.success,response.error,response.cancelled) and Auto mode router telemetry (automode.routerModelSelection,automode.routerFallback). - Adds/updates unit tests validating aggregate measurements and telemetry emission.
Show a summary per file
| File | Description |
|---|---|
| extensions/copilot/src/platform/image/common/imageTelemetry.ts | New shared helper that computes aggregate image telemetry measurements from messages/references. |
| extensions/copilot/src/platform/image/common/test/imageTelemetry.spec.ts | New tests for MIME/source/byte aggregation and omission when no images exist. |
| extensions/copilot/src/platform/endpoint/node/automodeService.ts | Adds image aggregate measurements to Auto mode router telemetry events. |
| extensions/copilot/src/platform/endpoint/node/test/automodeService.spec.ts | Updates test to assert router selection telemetry includes image measurements. |
| extensions/copilot/src/extension/prompt/node/chatMLFetcherTelemetry.ts | Extends chat response telemetry to include image aggregate measurements. |
| extensions/copilot/src/extension/prompt/node/chatMLFetcher.ts | Computes image measurements once per request and threads them through success/cancel/error telemetry paths. |
Copilot's findings
- Files reviewed: 6/6 changed files
- Comments generated: 1
Comment on lines
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| function getImageTelemetryInputFromUrl(url: string, mediaType: string | undefined): ImageTelemetryInput { | ||
| if (!url.startsWith('data:')) { | ||
| return { mimeType: mediaType, source: 'url' }; | ||
| } | ||
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| const commaIndex = url.indexOf(','); | ||
| if (commaIndex === -1) { | ||
| return { mimeType: mediaType, source: 'unknown' }; | ||
| } | ||
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| const metadata = url.slice(5, commaIndex).split(';'); | ||
| const dataMimeType = metadata[0] || undefined; | ||
| const isBase64 = metadata.includes('base64'); | ||
| return { | ||
| mimeType: mediaType ?? dataMimeType, | ||
| byteLength: isBase64 ? getBase64ByteLength(url.slice(commaIndex + 1)) : undefined, |
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bryanchen-d
approved these changes
May 21, 2026
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This adds non-restricted aggregate image metadata to Copilot chat telemetry.
Changes
response.successresponse.errorresponse.cancelledPrivacy
This does not send image content, base64 payloads, OCR/text extracted from images, file paths, URLs, image IDs, hashes, prompts, or model responses.
The telemetry is limited to aggregate counts/sizes/categories:
Restricted/private telemetry, if needed later, should be added separately through the Hydro/CTS path.