[Bug 1943639] [NEW] project/instances/attach_interface has O(N) scaling time complexity for opening form

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You have been subscribed to a public bug by Ubuntu Foundations Team Bug Bot (crichton):

The time complexity of opening the project/instances/attach_interface
form box is O(N) where N is the number of networks in the project. This
is due to

https://opendev.org/openstack/horizon/src/branch/master/openstack_dashboard/dashboards/project/instances/utils.py#L210

Which loops over the networks and requests the ports associated with the
network. For large projects this scaling behavior can become
prohibitive.

** Affects: horizon
     Importance: Undecided
     Assignee: Nicolas Bock (nicolasbock)
         Status: Fix Released

** Affects: horizon (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: horizon (Ubuntu Focal)
     Importance: Undecided
         Status: New


** Tags: in-stable-ussuri in-stable-wallaby in-stable-xena patch
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project/instances/attach_interface has O(N) scaling time complexity for opening form
https://bugs.launchpad.net/bugs/1943639
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