my_app.rb

  get '/uptime' do
    servers = YAML.load_file('uptime.yaml')
    ifraw = params['raw']
    if ['1','true','on'].include? ifraw
      erb :raw_uptime, :locals => {'servers' => servers}, :layout => false
    else
      erb :uptime, :locals => {'servers' => servers}
    end

raw_uptime.erb

<% servers.each do |type, value| %>
  <%= type.to_s %>
<%#  puts value.to_s %>
  <% value.each do |server, info| %>
  <%= server %>
    <% Net::SSH.start(info["host"], info["user"], :port => info["port"]) do |ssh| %>
      <% output = ssh.exec!('uptime') %>
      <%= output %>
    <% end %>
  <% end %>
<% end %>

uptime.erb

<% servers.each do |type, value| %>
  <h2><%= type.to_s %></h2>
<%#  puts "#{"\e[34m" + value.to_s}" %>
  <% value.each do |server, info| %>
  <h3><span style="color: green;">&nbsp;&nbsp;&nbsp;&nbsp;<%= server %></span></h3>
    <% Net::SSH.start(info["host"], info["user"], :port => info["port"]) do |ssh| %>
      <% output = ssh.exec!('uptime') %>
      <strong>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<%= output %></strong>
    <% end %>
  <% end %>
<% end %>