Optimize query for job events for a single job to speed up loading job details page.

awx/api/views.py

@@ -3502,6 +3502,16 @@ class JobJobEventsList(BaseJobEventsList):
 
     parent_model = Job
 
+    def get_queryset(self):
+        job = self.get_parent_object()
+        self.check_parent_access(job)
+        qs = job.job_events.all()
+        qs = qs.select_related('host')
+        qs = qs.prefetch_related('hosts', 'children')
+        if self.request.user.is_superuser or self.request.user.is_system_auditor:
+            return qs.all()
+        return qs.filter(Q(host__isnull=True) | Q(host__in=host_qs))
+
 
 class JobJobPlaysList(BaseJobEventsList):