Set low custom apdex for Audit Events

Audit Events features are data-intensive endpoints that users do not
expect to load as quickly as other endpoints. This sets a custom
apdex SLI urgency of "low" to allow for the historically relatively
slower load times of these features.

ee/app/controllers/groups/audit_events_controller.rb

@@ -14,6 +14,8 @@ class Groups::AuditEventsController < Groups::ApplicationController
 
   feature_category :audit_events
 
+  urgency :low
+
   def index
     @is_last_page = events.last_page?
     @events = AuditEventSerializer.new.represent(events)

ee/app/controllers/projects/audit_events_controller.rb

@@ -13,6 +13,8 @@ class Projects::AuditEventsController < Projects::ApplicationController
 
   feature_category :audit_events
 
+  urgency :low
+
   def index
     @is_last_page = events.last_page?
     @events = AuditEventSerializer.new.represent(events)

ee/lib/api/audit_events.rb

@@ -4,6 +4,8 @@ module API
   class AuditEvents < ::API::Base
     include ::API::PaginationParams
 
+    urgency :low
+
     feature_category :audit_events
 
     before do