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A extensible way of exposing information about a running web app.

It presents a JSON object with information about current ruby, rails and anything else you want to show that can be accessed through ruby.


Whatsup can be used with any Rack app, by including the middleware Whatsup::StatusPage with a configuration object. See below for framework specific instructions


Whatsup requires explicit configuration of username and password. If you don't want any authentication, set username and password to empty string.


The Whatsup gem includes a Railtie which inserts the middleware in the middleware chain and exposes the configuration object as config.whatsup.

The only thing needed is to put it in your gemfile and configure it by in your application.rb putting something like

    config.whatsup.username = "admin"
    config.whatsup.password = "topsecret"

You can also put the configuration in an initializer (config/initializers/whatsup.rb):

Rails.application.config.whatsup.username = "admin"
Rails.application.config.whatsup.password = "topsecret"


  • Put it in your gemfile

  • Add the following to your app:

      config =
      config.username = "admin"
      config.password = "topsecret"
      use Whatsup::StatusPage, config


After this, you can access the status at /__status, using the username and password specified above.

What does it show?

The app is built up by Collectors (The standard ones are defined in Whatsup::Collectors). A Collector is something that responds to call without arguments and returns a Hash

Included with the gem is collectors for:

  • BundlerStatus: Included i Bundler is defined. Gives you information about all gems tracked by Bundler.
  • RailsStatus: Included if Rails is defined. Gives you information about Rails version, env, configuration and middleware
  • RubyStatus: Always included. Includes Ruby version and GC stats.
  • CacheStatus: Included if Rails is defined. Gives you information about the Rails cache: type and stats, if Rails.cache responds to #stats.
  • ResqueStatus: Included if Resque is defined. Gives you queue length of all queues returned by Resque.queues.
  • SinatraStatus. Included if Sinatra is defined. Gives you Sinatra version.

But I want more stuff in my status page!

Easy! Register your own collector. As mentioned earlier, a collector is something that responds to call without arguments. That means that the simplest collector is:

->() { "hello world" }

but a collector can also be an object or a class.

Which can be registered by using the register method on the Configuration object. It takes two arguments, the first is the key the collected information will be under in the status json and the second is the actual collector.

If you are using Rails, this is obtained by config.whatsup in your application.rb:

config.whatsup.register(:hello, ->() { "Hello world" })

If using Sinatra, you already have a Configuration object to use:

config =
config.username = "admin"
config.password = "topsecret"
config.register(:hello, ->() { "hello world" }
use Whatsup::StatusPage, config

For some examples, see the included collectors for examples (lib/whatsup/collectors.rb)

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