Tested on neutron/master in devstack.
When I associate or disassociate a floating IP I get a notification indicating the new fixed IP and port association, but the status still indicates the current value (so for associate, the notification contains "fixed_ip_address":"a.b.c.d", "status": "DOWN") because there's a short latency time before the FIP is marked as ACTIVE.
I see the status change after a very short period after in the q-svc log:
New status for floating IP 8470e622-0f3b-419f-ac21-deed658d3260: ACTIVE
There's no notification emitted representing this state change, however. The same is true on disassociate; the port and fixed IP are cleared but the status is indicated ACTIVE and there's no notification marking it DOWN.
E.g.
$ neutron floatingip-create 0e97853d-3ac0-4c08-a8b3-f6bfa443dd24
{"event_type": "floatingip.create.end", "payload": {"floatingip": {"router_id": null, "status": "DOWN", "description": "", "tenant_id": "c1b853bf78bc43c69daa8d42cb9fb07f", "floating_network_id": "0e97853d-3ac0-4c08-a8b3-f6bfa443dd24", "fixed_ip_address": null, "floating_ip_address": "172.25.0.11", "port_id": null, "id": "6442165e-4caa-437c-9377-196f4db638f9"}}, "publisher_id": "network.devstack", "ctxt": {...}, "metadata": {"timestamp": "2016-06-17 16:44:20.600943", "message_id": "547b0f34-1bc0-4fbc-8e58-a0c2d2dc1751"}}
$ neutron floatingip-associate 6442165e-4caa-437c-9377-196f4db638f9 8068c884-1ab4-42d9-97d0-f65848fca2b0
{"event_type": "floatingip.update.end", "payload": {"floatingip": {"router_id": "390ab366-0eee-46e9-a07f-f49cf0b31652", "status": "DOWN", "description": "", "tenant_id": "c1b853bf78bc43c69daa8d42cb9fb07f", "floating_network_id": "0e97853d-3ac0-4c08-a8b3-f6bfa443dd24", "fixed_ip_address": "172.40.0.4", "floating_ip_address": "172.25.0.11", "port_id": "8068c884-1ab4-42d9-97d0-f65848fca2b0", "id": "6442165e-4caa-437c-9377-196f4db638f9"}}, "publisher_id": "network.devstack", "ctxt": {...}, "metadata": {"timestamp": "2016-06-17 16:44:50.149631", "message_id": "f6f7ec1f-6363-49b0-b10f-84fd81e0a506"}}
I assume this one was discussed in the neutron meeting and decided it should be an RFE??
Adding notifications for FIP seemed pretty straight forward to me, and hence I was assuming it could move straight to tech discussions via patch reviews.