Add elastic APM to the worker

Gemfile

@@ -26,6 +26,7 @@ gem 'sidekiq', '= 5.2.3'
 gem 'sinatra', :require => nil
 gem 'supplejack_common', git: 'https://github.com/DigitalNZ/supplejack_common.git', tag: 'v2.7.0'
 # gem 'supplejack_common', path: '/webspace/supplejack/common'
+gem 'elastic-apm'
 
 gem 'whenever', require: false
 gem 'rubocop', require: false

Gemfile.lock

@@ -157,6 +157,9 @@ GEM
     dimensions (1.3.0)
     domain_name (0.5.20180417)
       unf (>= 0.0.5, < 1.0.0)
+    elastic-apm (2.8.0)
+      concurrent-ruby (~> 1.0)
+      http (>= 3.0)
     erubi (1.7.1)
     factory_bot (4.8.2)
       activesupport (>= 3.0.0)
@@ -174,8 +177,15 @@ GEM
     globalid (0.4.1)
       activesupport (>= 4.2.0)
     htmlentities (4.3.4)
+    http (4.1.1)
+      addressable (~> 2.3)
+      http-cookie (~> 1.0)
+      http-form_data (~> 2.0)
+      http_parser.rb (~> 0.6.0)
     http-cookie (1.0.3)
       domain_name (~> 0.5)
+    http-form_data (2.1.1)
+    http_parser.rb (0.6.0)
     i18n (1.1.0)
       concurrent-ruby (~> 1.0)
     jmespath (1.4.0)
@@ -381,6 +391,7 @@ DEPENDENCIES
   chronic
   cucumber-rails
   database_cleaner
+  elastic-apm
   factory_bot_rails
   figaro
   kaminari

config/elastic_apm.yml

@@ -1,4 +1,4 @@
-server_url: <%= "http://#{ENV['HOST_IP']}:8200" %>
+server_url: <%= ENV['ELASTIC_APM_SERVER_URL'] || "http://#{ENV['HOST_IP']}:8200" %>
 service_name: <%= "Supplejack Worker - #{Rails.env}" %>
 pool_size: <%= ENV['ELASTIC_APM_POOL_SIZE'] || 5 %>
 disable_send: <%= ENV['ELASTIC_APM_DISABLE_SEND'] || true %>