How to approach debugging a dead metric pull request?

[islamhamdi]

We use prometheus and prometheus-plugs for pulling metrics out of our elixir services, usually the amount of
data pulled is around 80-100 MB which we think it's too much.

We set a hard timeout of 10 mins for all our endpoints requests and on a daily basis we get failed prometheus pull requests due to timeouts (1 request exceeds 10 mins), we'd like to look more into debugging what's happening inside, whether it's an issue with re-formatting the payload or with its size. Is there a debugging mode that we can enable for better insights?