1 files changed, 18 insertions, 0 deletions
diff --git a/config/initializers/instrumentation.rb b/config/initializers/instrumentation.rb
new file mode 100644
index 000000000..8483f2be2
--- /dev/null
+++ b/config/initializers/instrumentation.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+instrumentation_hostname = ENV.fetch('INSTRUMENTATION_HOSTNAME') { 'localhost' }
+
+ActiveSupport::Notifications.subscribe(/process_action.action_controller/) do |*args|
+  event      = ActiveSupport::Notifications::Event.new(*args)
+  controller = event.payload[:controller]
+  action     = event.payload[:action]
+  format     = event.payload[:format] || 'all'
+  format     = 'all' if format == '*/*'
+  status     = event.payload[:status]
+  key        = "#{controller}.#{action}.#{format}.#{instrumentation_hostname}"
+
+  ActiveSupport::Notifications.instrument :performance, action: :measure, measurement: "#{key}.total_duration", value: event.duration
+  ActiveSupport::Notifications.instrument :performance, action: :measure, measurement: "#{key}.db_time", value: event.payload[:db_runtime]
+  ActiveSupport::Notifications.instrument :performance, action: :measure, measurement: "#{key}.view_time", value: event.payload[:view_runtime]
+  ActiveSupport::Notifications.instrument :performance, measurement: "#{key}.status.#{status}"
+end