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[Rodolfo Alonso <2106713@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Since [1][2], both the Metadata agent and the OVN Metadata agent do not
return anything if the instance is not found. That was marked as a TODO
in [3][4].

The goal of this bug is to address this TODO and return the proper HTTP
404 error to the metadata client.

This bug is related to:
* https://bugs.launchpad.net/neutron/+bug/2099896: [eventlet-removal] Remove the usage of eventlet in the Metadata agent
* https://bugs.launchpad.net/neutron/+bug/2087942: [eventlet-removal] Remove the usage of eventlet in the OVN agent

[1]https://review.opendev.org/c/openstack/neutron/+/942916
[2]https://review.opendev.org/c/openstack/neutron/+/937545
[3]https://github.com/openstack/neutron/blob/e0d9797a43b85c5d79aab0c81a56e937bf2ee6ce/neutron/agent/metadata/agent.py#L194
[4]https://github.com/openstack/neutron/blob/e0d9797a43b85c5d79aab0c81a56e937bf2ee6ce/neutron/agent/ovn/metadata/server_socket.py#L170

** Affects: neutron
     Importance: Medium
     Assignee: Rodolfo Alonso (rodolfo-alonso-hernandez)
         Status: Confirmed

** Changed in: neutron
     Assignee: (unassigned) => Rodolfo Alonso (rodolfo-alonso-hernandez)

** Changed in: neutron
   Importance: Undecided => Medium

** Changed in: neutron
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/2106713

Title:
  Fix metadata return code when the instance is not present

Status in neutron:
  Confirmed

Bug description:
  Since [1][2], both the Metadata agent and the OVN Metadata agent do
  not return anything if the instance is not found. That was marked as a
  TODO in [3][4].

  The goal of this bug is to address this TODO and return the proper
  HTTP 404 error to the metadata client.

  This bug is related to:
  * https://bugs.launchpad.net/neutron/+bug/2099896: [eventlet-removal] Remove the usage of eventlet in the Metadata agent
  * https://bugs.launchpad.net/neutron/+bug/2087942: [eventlet-removal] Remove the usage of eventlet in the OVN agent

  [1]https://review.opendev.org/c/openstack/neutron/+/942916
  [2]https://review.opendev.org/c/openstack/neutron/+/937545
  [3]https://github.com/openstack/neutron/blob/e0d9797a43b85c5d79aab0c81a56e937bf2ee6ce/neutron/agent/metadata/agent.py#L194
  [4]https://github.com/openstack/neutron/blob/e0d9797a43b85c5d79aab0c81a56e937bf2ee6ce/neutron/agent/ovn/metadata/server_socket.py#L170

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