Fixes #36898 - Add rack-mini-profiler for profiling

[m-bucher]

Packaging PR: theforeman/foreman-packaging#9953

[ekohl]

I think this looks good, but I'd like to wait until after branching so we have a bit more time to evaluate it in nightly.

[m-bucher]

Agreed, would it make sense to move the bullet-gem into the profiling-group as well?

[ekohl]

Possibly, but it's only enabled in development mode:

foreman/config/environments/development.rb

Lines 47 to 56 in 8bd953d

	if defined?(Bullet)
	config.after_initialize do
	Bullet.enable = true
	Bullet.bullet_logger = true
	Bullet.console = true
	Bullet.rails_logger = true
	Bullet.add_footer = true
	Bullet.counter_cache_enable = false
	end
	end

So if you move it to profiling (which you also intend to be usable in production mode) the I'd expect it to setup to also happen in the production environment.

[m-bucher]

I tried it, but the bullet.log could not be written in production due to missing permissions :-(

[ekohl]

That surprises me because https://github.com/flyerhzm/bullet#configuration states:

Bullet.bullet_logger: log to the Bullet log file (Rails.root/log/bullet.log)

in production Rails.root is /usr/share/foreman and /usr/share/foreman is a symlink to /var/log/foreman, which is owned by foreman. So it should be able to write there.

[sbernhard]

Branching was already done some weeks ago. Can we continue with this?