slack_monit_alert.rb

#!/usr/bin/ruby

require 'net/https'
require 'json'
require 'yaml'

slack_cfg = YAML.load_file("/root/.slackrc.yml")

#uri = URI.parse("https://#{slack_cfg['team']}.slack.com/services/hooks/incoming-webhook?token=#{slack_cfg['token']}")
uri = URI.parse(slack_cfg['hook_url'])
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
request = Net::HTTP::Post.new(uri.request_uri, {'Content-Type' => 'application/json'})
request.body = {
  "channel"  => "#monit",
  "username" => "[MONIT]",
  "text"     => "[#{ENV['MONIT_HOST']}] #{ENV['MONIT_SERVICE']} - #{ENV['MONIT_DESCRIPTION']}",
  "mrkdwn"   => true
}.to_json
response = http.request(request)
puts response.body

it's the beauty indeed - simple and efficient one.

Yes, simplicity is the best.