Add a hint header for max job events for the UI

awx/api/views.py

@@ -3407,6 +3407,10 @@ class BaseJobEventsList(SubListAPIView):
     relationship = 'job_events'
     view_name = _('Job Events List')
 
+    def finalize_response(self, request, response, *args, **kwargs):
+        response['X-UI-Max-Events'] = settings.RECOMMENDED_MAX_EVENTS_DISPLAY_HEADER
+        return super(BaseJobEventsList, self).finalize_response(request, response, *args, **kwargs)
+
 
 class HostJobEventsList(BaseJobEventsList):
 

awx/settings/defaults.py

@@ -152,6 +152,10 @@ REMOTE_HOST_HEADERS = ['REMOTE_ADDR', 'REMOTE_HOST']
 # Note: This setting may be overridden by database settings.
 STDOUT_MAX_BYTES_DISPLAY = 1048576
 
+# Returned in the header on event api lists as a recommendation to the UI
+# on how many events to display before truncating/hiding
+RECOMMENDED_MAX_EVENTS_DISPLAY_HEADER = 10000
+
 # The maximum size of the ansible callback event's res data structure
 # beyond this limit and the value will be removed
 MAX_EVENT_RES_DATA = 700000