neutron is capable of registering ovn and displaying it in the output of "network agent list", but currently Charmed OpenStack doesn't.
https://opendev.org/openstack/networking-ovn/commit/53a1c87cbf2de25e4d18696987179f40f6c5d67f
$ openstack network agent list
+----------------------------------------------+----------------------+----------------------------------------------+-------------------+-------+-------+----------------+
| ID | Agent Type | Host | Availability Zone | Alive | State | Binary |
+----------------------------------------------+----------------------+----------------------------------------------+-------------------+-------+-------+----------------+
| juju-0788ee-focal-xena-8.project.serverstack | OVN Controller agent | juju-0788ee-focal-xena-8.project.serverstack | | :-) | UP | ovn-controller |
+----------------------------------------------+----------------------+----------------------------------------------+-------------------+-------+-------+----------------+
This is useful to gain visibility on neutron-ovn-metadata-agent when troubleshooting.
This is a sample of network agent list for a non charmed openstack:
+--------------------------------------+------------------------------+------------------------------------+-------------------+-------+-------+----------------------------+
| ID | Agent Type | Host | Availability Zone | Alive | State | Binary |
+--------------------------------------+------------------------------+------------------------------------+-------------------+-------+-------+----------------------------+
| f95dd554-258b-4f71-bf4a-9bba214f14f3 | DHCP agent | controller-0.localdomain | nova | :-) | UP | neutron-dhcp-agent |
| a6a25533-39ce-5673-b897-1552e63c2693 | OVN Metadata agent | compute-0.localdomain | | :-) | UP | neutron-ovn-metadata-agent |
| 3450910c-8bb3-4f59-a132-0fd2b0c76505 | OVN Controller agent | compute-0.localdomain | | :-) | UP | ovn-controller |
| 24b6b468-b882-46dc-a042-967f68bcceaa | OVN Controller Gateway agent | controller-0.localdomain | | :-) | UP | ovn-controller |
+--------------------------------------+------------------------------+------------------------------------+-------------------+-------+-------+----------------------------+
