Tracking requests through Remix callbacks

[christopherboyd]

We perform a few common actions on every HTTP request, such as collecting and logging perf metrics. To do so, it seems like it would be nice to have a stable request identifier passed to each Remix callback.

Our project currently runs code per request in four places: route loader, route action, handleRequest in entry.server.tsx and handleDataRequest in entry.server.tsx. Unless I am missing an existing field, I think it would be helpful if:

• the request reference passed to each method was stable (it is currently modified when passed to the route loader)
  or
• handleRequest in entry.server.tsx received the request context (it is already passed to the other 3 locations)

Users can currently use the server code wrapping Remix to handle per request actions, but that requires duplicate code per server host (Express, AWS, Vercel, etc). I would be happy to propose a pull request for either of the methods above if one sounded like a good addition.