Add telemetry event to log router URL for auto mode model routing

[aashna]

Adds an autoMode.routerDecision telemetry event that fires when the router decision fetcher successfully selects a model. This lets us track adoption of the new router model and differentiate between users on the new vs. current router.

Properties logged:

routerUrl — the router API endpoint used
chosenModel — the model selected by the router
predictedLabel — the classification label from the router

Measurements logged:

confidence — router's confidence score
latencyMs — round-trip latency of the routing call

[Copilot]

Pull request overview

Adds a new GitHub telemetry event emitted when the auto mode router returns a successful routing decision, enabling tracking of router usage and outcomes in the endpoint routing flow.

Changes:

• Inject ITelemetryService into AutomodeService and RouterDecisionFetcher.
• Emit autoMode.routerDecision telemetry on successful router decision fetch, including router URL + decision details and confidence/latency measurements.
• Extend unit tests to validate telemetry emission behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/platform/endpoint/node/routerDecisionFetcher.ts	Sends autoMode.routerDecision telemetry after a validated successful router response.
src/platform/endpoint/node/automodeService.ts	Wires telemetry service into the router decision path via DI and passes it to RouterDecisionFetcher.
src/platform/endpoint/node/test/routerDecisionFetcher.spec.ts	Adds unit coverage asserting the telemetry event payload emitted by the fetcher.
src/platform/endpoint/node/test/automodeService.spec.ts	Updates constructor usage and adds an integration-style test that telemetry is sent when routing occurs.

[luabud]

@aashna I think it might be missing a GDPR tag. Something like:

   /* __GDPR__
       "autoMode.routerDecision" : {
           "routerUrl" : { "classification": "SystemMetaData", "purpose": "FeatureInsight" },
           "chosenModel" : { "classification": "SystemMetaData", "purpose": "FeatureInsight" },
           "predictedLabel" : { "classification": "SystemMetaData", "purpose": "FeatureInsight" },
           "confidence" : { "classification": "SystemMetaData", "purpose": "FeatureInsight", "isMeasurement": true },
           "latencyMs" : { "classification": "SystemMetaData", "purpose": "PerformanceAndHealth", "isMeasurement": true }
       }
   */

Here's an example:

vscode-copilot-chat/src/extension/conversation/vscode-node/userActions.ts

Line 64 in 788a687

/* __GDPR__

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

[aashna]

@microsoft-github-policy-service agree company="Microsoft"

…

-Aashna Garg

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