diff --git a/awx/main/analytics/collectors.py b/awx/main/analytics/collectors.py
index e6ee155a83b8..27108e66b3e3 100644
--- a/awx/main/analytics/collectors.py
+++ b/awx/main/analytics/collectors.py
@@ -239,8 +239,8 @@ def instance_info(since, include_hostnames=False, **kwargs):
     # Use same method that the TaskManager does to compute consumed capacity without querying all running jobs for each Instance
     active_tasks = models.UnifiedJob.objects.filter(status__in=['running', 'waiting']).only('task_impact', 'controller_node', 'execution_node')
     tm_instances = TaskManagerInstances(active_tasks, instance_fields=['uuid', 'version', 'capacity', 'cpu', 'memory', 'managed_by_policy', 'enabled'])
-    for instance in tm_instances.instance_objects:
-        consumed_capacity = tm_instances[instance.hostname].consumed_capacity
+    for tm_instance in tm_instances.instances_by_hostname.values():
+        instance = tm_instance.obj
         instance_info = {
             'uuid': instance.uuid,
             'version': instance.version,
@@ -249,8 +249,8 @@ def instance_info(since, include_hostnames=False, **kwargs):
             'memory': instance.memory,
             'managed_by_policy': instance.managed_by_policy,
             'enabled': instance.enabled,
-            'consumed_capacity': consumed_capacity,
-            'remaining_capacity': instance.capacity - consumed_capacity,
+            'consumed_capacity': tm_instance.consumed_capacity,
+            'remaining_capacity': instance.capacity - tm_instance.consumed_capacity,
         }
         if include_hostnames is True:
             instance_info['hostname'] = instance.hostname
diff --git a/awx/main/scheduler/task_manager_models.py b/awx/main/scheduler/task_manager_models.py
index b5071266ec8d..b84cdfcf8212 100644
--- a/awx/main/scheduler/task_manager_models.py
+++ b/awx/main/scheduler/task_manager_models.py
@@ -34,14 +34,12 @@ def remaining_capacity(self):
 
 
 class TaskManagerInstances:
-    def __init__(self, active_tasks, instances=None, instance_fields=['node_type', 'capacity', 'hostname', 'enabled']):
+    def __init__(self, active_tasks, instances=None, instance_fields=('node_type', 'capacity', 'hostname', 'enabled')):
         self.instances_by_hostname = dict()
-        self.instance_objects = []
         if instances is None:
             instances = Instance.objects.filter(hostname__isnull=False, enabled=True).exclude(node_type='hop').only(*instance_fields)
         for instance in instances:
             self.instances_by_hostname[instance.hostname] = TaskManagerInstance(instance)
-            self.instance_objects.append(instance)
 
         # initialize remaining capacity based on currently waiting and running tasks
         for task in active_tasks: