Formula assumes there's a repository available, when there seldom is.

[erenfro]

This formula has definite potential, but it assumes that there is always a package repository available for it to be installed from, and even depends on it.

There are 3rd party respos for CentOS/RHEL and Fedora, but not for any other distro. It might be better to work this repository into utilizing saltstack's archive.extracted method instead, which can pull from appropriate github URLs instead, with appropriate architecture mapping accordingly. For example, there are no prometheus packages available for debian. And the package names differ from what is being expected from the current formula.

This should be a consideration to think upon, I think, especially since the development of Prometheus is still early in and constantly developed and improved upon.