Metric data consumable in external applications

### Problem Statement

I would like to combine data from within sentry with data from other applications to make reports and dashboards in Microsoft Power BI or other similar applications. For example, I can build a dashboard about my customers containing their contract information from our sales system, their usage statistics from Sentry showing what features they are using in the application and how often, how much support they are using from our service desk etc. to give us a good overall picture of the customer in one place.

### Solution Brainstorm

There are a couple of different approaches which could be taken.

1. A native integration with Power BI
2. Exposing this data in an OData feed
3. Exposing this data in the API, however this would not be preferable as paging etc. makes it difficult to work with

### Product Area

APIs

No files, tests, or entry points are identified; start by reviewing the existing APIs and metric data available in Sentry. Clarify the required data, access model, and whether a Power BI integration, OData feed, or API change is preferred; done means one approach has an agreed scope and implementation plan.

Written by the indexing model from the issue text.