ruby - [promethues, rails]How to enable promethues on rails server -


i have live rails application.

and trying install prometheus monitoring service , ruby client

i running on server thses tutorial.

it working good!

but after hours these merics url died.

how working on live server?

if adding exist project.

below, promethus not found error

i, [2015-08-31t10:54:40.274066 #3542]  info -- : refreshing gem list /path/shared/bundle/ruby/2.2.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:247:in `require': cannot load such file -- prometheus/client/rack/collector (loaderror)     /path/shared/bundle/ruby/2.2.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:247:in `block in require'     /path/shared/bundle/ruby/2.2.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:232:in `load_dependency'     /path/shared/bundle/ruby/2.2.0/gems/activesupport-4.1.6/lib/active_support/dependencies.rb:247:in `require'     config.ru:8:in `block in <main>'     /path/shared/bundle/ruby/2.2.0/gems/rack-1.5.5/lib/rack/builder.rb:55:in `instance_eval'     /path/shared/bundle/ruby/2.2.0/gems/rack-1.5.5/lib/rack/builder.rb:55:in `initialize'     config.ru:1:in `new'     config.ru:1:in `<main>'     /path/shared/bundle/ruby/2.2.0/gems/unicorn-4.9.0/lib/unicorn.rb:48:in `eval'     /path/shared/bundle/ruby/2.2.0/gems/unicorn-4.9.0/lib/unicorn.rb:48:in `block in builder'     /path/shared/bundle/ruby/2.2.0/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:768:in `call'     /path/shared/bundle/ruby/2.2.0/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:768:in `build_app!'     /path/shared/bundle/ruby/2.2.0/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:632:in `init_worker_process'     path/shared/bundle/ruby/2.2.0/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:655:in `worker_loop'     /path/shared/bundle/ruby/2.2.0/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:529:in `spawn_missing_workers'     /path/shared/bundle/ruby/2.2.0/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:540:in `maintain_worker_count'     /path/shared/bundle/ruby/2.2.0/gems/unicorn-4.9.0/lib/unicorn/http_server.rb:294:in `join'     /path/shared/bundle/ruby/2.2.0/gems/unicorn-4.9.0/bin/unicorn:126:in `<top (required)>'     /path/shared/bundle/ruby/2.2.0/bin/unicorn:23:in `load'     /path/shared/bundle/ruby/2.2.0/bin/unicorn:23:in `<main>'

eg.)

i have 2 server(promethus_server, live_server + prometheus client)

live_server, promethus_client path different path.

i runnning promethus_client manually on server 

$ rails new client $ bundle (adding promethus-client gem) $ vi config.ru (add promethus lib) $ rail s --binding=ip

is ircorrect?

here's config.ru looks recent app upgraded: 

require ::file.expand_path('../config/environment', file) require 'rack' require 'prometheus/client/rack/collector' require 'prometheus/client/rack/exporter'  use prometheus::client::rack::collector use prometheus::client::rack::exporter  run rails.application

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