Application Insights REST Demo App Metrics are Erroring

Any /metrics query I try with the DEMO_APP is returning an InternalServerFault, for example:

```bash
curl "https://api.applicationinsights.io/v1/apps/DEMO_APP/metrics/exceptions/server" -H "x-api-key: DEMO_KEY"
```

```json
{"error":{"message":"Unexpected error occurred","code":"InternalServerFault","innererror":{"code":"InternalServerFault","message":"Something went wrong while running the query","correlationId":"b6b4496b-2b03-4ac7-b689-1a886e65bfc5"}}}%
```

Same when using the website https://dev.applicationinsights.io/apiexplorer/metrics?appId=DEMO_APP&apiKey=DEMO_KEY

Start by reproducing the failure with the provided curl request and the Application Insights API Explorer, then inspect the repository's Application Insights metrics REST API specification. Done means the DEMO_APP metrics query returns a successful response instead of InternalServerFault.

Written by the indexing model from the issue text.