Notify Sentry of a new release via Capistrano with webhook

deploy.rb

# This task will notify Sentry via webhook that you have deployed
# a new release. It uses the release timestamp as the `version`
# (like 20151113182847) and the git ref as the optional `ref` value.
#
# This task requires `:sentry_uri` to be set.  This can be done in 
# a site-specific config/deploy/xxx.rb file.  This can be obtained from
# the project's settings page.

# For Rails app, this goes in config/deploy.rb

namespace :sentry do
  task :notify do
    run_locally do
      require 'uri'
      require 'net/https'
      require 'json'

      uri = URI.parse(fetch(:sentry_uri))
      req = Net::HTTP::Post.new(uri.request_uri)

      params = {
        version: fetch(:release_timestamp),
        ref: fetch(:current_revision),
      }
      req.body = ::JSON.dump(params)

      response = Net::HTTP.start(uri.host, uri.port, use_ssl: true) { |h| h.request(req) }
    end
  end
end

# If you want deployments to be published in every Rails environment, put this
# in config/deploy.rb, otherwise put it your environment-specific deploy file
# i.e. config/deploy/production.rb

after 'deploy:published', 'sentry:notify'