Keep your deploy.rb clean! Move all customs tasks to config/deploy/recipes/. Define triggers only in deploy.rb file.

deploy.rb

require 'bundler/capistrano'

logger.level = Logger::DEBUG # Logger::IMPORTANT

default_run_options[:pty] = true
ssh_options[:forward_agent] = true

server 'example.com', :web, :app, :db, :sidekiq, primary: true

set :application, 'example'
set :user, 'www'
set :deploy_via, :remote_cache
set :use_sudo, false

# Multistage configuration
set :stages, %w[ production staging ]
set :default_stage, 'production'
require 'capistrano/ext/multistage'

set :deploy_to, "/home/#{user}/example/"

set :scm, 'git'
set :repository, 'git@github.com:example/example.git'

# Sidekiq configuration
require 'sidekiq/capistrano'
set :sidekiq_role, :sidekiq
set :sidekiq_pid, "#{current_path}/tmp/pids/sidekiq.pid"
set :sidekiq_processes, 4

%w[ deploy_setup_webservers deploy_setup_config deploy_symlink_config ].each do |recipe|
  load File.expand_path("../deploy/recipes/#{recipe}.rb", __FILE__)
end

# Setup unicorn init script and nginx
after 'deploy:setup', 'deploy:setup_webservers'

# Bootstrap *.example.yml files
after 'deploy:setup', 'deploy:setup_config'

# Symlink config files from shared to current
after 'deploy:finalize_update', 'deploy:symlink_config'

# Restart Unicorn
require 'capistrano-unicorn'
after 'deploy:restart', 'unicorn:restart'

# Notify NewRelic
require 'new_relic/recipes'
after 'deploy:restart', 'newrelic:notice_deployment'

# Notify Hipchat
require 'hipchat/capistrano'
set :hipchat_token, 'secret'
set :hipchat_room_name, 'secret'

# Keep only the last 5 releases
after 'deploy', 'deploy:cleanup'