Use sentry in env production only

Gemfile

@@ -293,6 +293,9 @@ end
 
 group :production do
   gem "gitlab_meta", '7.0'
+
+  # Sentry integration
+  gem 'sentry-raven'
 end
 
 gem "newrelic_rpm", '~> 3.9.4.245'
@@ -314,6 +317,3 @@ gem 'oauth2', '~> 1.0.0'
 
 # Soft deletion
 gem "paranoia", "~> 2.0"
-
-# Sentry integration
-gem 'sentry-raven'

app/views/admin/application_settings/_form.html.haml

@@ -242,7 +242,9 @@
           = f.label :sentry_enabled do
             = f.check_box :sentry_enabled
             Enable Sentry
-          %span.help-block#sentry_help_block Sentry is an error reporting and logging tool
+          .help-block
+            Sentry is an error reporting and logging tool which is currently not shipped with GitLab, get it here:
+            %a{ href: 'https://getsentry.com', target: 'blank' } https://getsentry.com
 
     .form-group
       = f.label :sentry_dsn, 'Sentry DSN', class: 'control-label col-sm-2'

config/initializers/sentry.rb

@@ -3,15 +3,17 @@
 require 'gitlab/current_settings'
 include Gitlab::CurrentSettings
 
-# allow it to fail: it may do so when create_from_defaults is executed before migrations are actually done
-begin
+if Rails.env.production?
+  # allow it to fail: it may do so when create_from_defaults is executed before migrations are actually done
+  begin
     sentry_enabled = current_application_settings.sentry_enabled
-rescue
+  rescue
     sentry_enabled = false
-end
+  end
 
-if sentry_enabled
+  if sentry_enabled
     Raven.configure do |config|
       config.dsn = current_application_settings.sentry_dsn
     end
+  end
 end