Release deploy, sentry by capistrano 3

example.rb

require 'net/https'
require 'uri'
require 'json'

namespace :sentry do
    task :notify_deployment do
      run_locally do
        puts 'Notifying Sentry of release...'
        uri = URI.parse(SENTY_URL)
        http = Net::HTTP.new(uri.host, uri.port)
        http.use_ssl = true
        request = Net::HTTP::Post.new(uri.request_uri)
        request.body = {:version => fetch(:release_timestamp)}.to_json
        request.add_field('Content-Type', 'application/json')
        response = http.request(request)
        puts "Sentry response: #{response.body}"
      end
    end
end

after 'deploy:published', 'sentry:notify_deployment'