Generate metrics for requested fields

[robrichard]

It would be useful to know which parts of the schema are in use on production apps by logging which fields are requested. I'd like to build something similar to what @leebyron describes here: https://youtu.be/5pMDd1t2thc?t=35m30s

I think for a given query and schema, I would want a map of each type that is used in the query and the fields that are requested on that type. What is the best way to go about it?

A few ideas are

• A way to "wrap" the internals that invoke the resolve method, and keep a tally of each time its called on which types
• Analyze the AST of the entire query and derive it from this. I don't think the AST is schema aware so you can't map the fields back to their types

What do you recommend?

[KyleAMathews]

@robrichard I recommend you wait until this PR is merged and released :-) #402

[robrichard]

That's great! I'll close this and follow that PR.