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Reviewed:  https://review.opendev.org/c/openstack/neutron/+/938393
Committed: https://opendev.org/openstack/neutron/commit/1dabdf118d514e95cc54c02aedf1bf653c62c8f0
Submitter: "Zuul (22348)"
Branch:    master

commit 1dabdf118d514e95cc54c02aedf1bf653c62c8f0
Author: Rodolfo Alonso Hernandez <ralonsoh@xxxxxxxxxx>
Date:   Fri Jan 3 11:19:39 2025 +0000

    [eventlet-removal] Use non-eventlet metadata proxy in OVN metadata agent
    
    The new metadata proxy server implementation, used in the OVN agent, is
    now used in the OVN metadata agent.
    
    The same limitation applies: it is only possible to create a server inside
    a thread, running in the same process (same as with metadata_workers=0).
    The configuration variable metadata_workers no longer applies.
    
    Closes-Bug: #2087941
    Change-Id: If5d74d6e21a22e4f4dbed27ed9be828adad857e8


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/2087941

Title:
  [eventlet-removal] Remove the usage of eventlet in the OVN metadata
  agent

Status in neutron:
  Fix Released

Bug description:
  References:
  * https://etherpad.opendev.org/p/oct2024-ptg-neutron
  * https://etherpad.opendev.org/p/neutron-eventlet-deprecation

  Remove the import and usage of the eventlet library in the OVN
  metadata agent.

  ============================================================

  It doesn’t use RPC for communication with the Neutron API.

  It is not spawned using ``oslo_service.launch``. ``oslo.service`` is a
  framework library used by Neutron to run the agent processes.

  Imports ``ovsdbapp`` to create IDL connections. This library and
  ``ovs`` (imported by ``ovsdbapp``) work with ``eventlet`` and normal
  threads.

  The metadata driver (``MetadataDriver``) service is executed inside a ``UnixDomainWSGIServer``, that inherits from ``neutron.api.wsgi.Server``. This is the base class to create a WSGI server based on ``eventlet``.
  * When metadata_workers=0, the WSGI server creates a ``WorkerService`` to run the application (proxy handler). The ``WorkerService`` spawns the application inside a greenpool (``eventlet`` dependant).
  * When metadata_workers>0, a set of instances is spawned, based on the same  ``WorkerService`` class. Each instance is created using ``oslo_service.service.ProcessLauncher``, also based on ``eventlet``.

  Patch testing this agent without without patching the system modules (metadata_workers=2 (cpu/2)):
  * [eventlet] Remove eventlet from the OVN metadata agent: https://review.opendev.org/c/openstack/neutron/+/922329

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