Add Metric to Track Usage Source (Slack Bot vs Webapp)

[davidgxue]

Please describe the feature you'd like to see
Add Metric to Track Usage Source (Slack Bot vs Webapp)

Describe the solution you'd like
Add metric tracking so that we can see how many/what proportion of requests are from slack app vs webapp, and specifically be able to trace individual requests to see which one is from where

Are there any alternatives to this feature?
Perhaps we can also track specifically which slack server this is used, or other details that maybe useful.

[venkatajagannath]

@davidgxue @shillion

Are there any other metrics that might be useful?

I'm working on a different issue which will require an update to the request object and possibly the front end code too.

If there is any other information we would like, I can update the request object with those fields too.