add origin_fetch_resp_*_bytes in Stats struct

[kartheekkaipa]

Currently go-fastly do not have field for bytes fetched from origin for Stats response for GetStatsField function.

• origin_fetch_resp_body_bytes
• origin_fetch_resp_header_bytes

File: fastly/stats_historical.go

if it's okay, I will raise the PR for the change.

[kpfleming]

Indeed, those are documented here and here. A PR would be very welcome!

[kartheekkaipa]

I will start with changes.

I am getting 404 for the above links, can you please check the same.

Thank you

[kpfleming]

Oh, sorry, those were internal links, my apologies!

The public documentation for those fields is here.

Take a look at the CONTRIBUTING and TESTING files to understand what you'll need to do to enhance the existing test fixtures to support those new fields.