[Bug 2112492] Re: neutron-metadata-agent shows XXX (dead) status despite being functional in Neutron 26.0.0

[Tony Breeds]

** Also affects: neutron (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2112492

Title:
  neutron-metadata-agent shows XXX (dead) status despite being
  functional in Neutron 26.0.0

Status in neutron:
  Confirmed
Status in neutron package in Ubuntu:
  New

Bug description:
  Environment:
  - OpenStack Release: 2025.1 (Epoxy) / Neutron 26.0.0
  - OS: Ubuntu 24.04 LTS
  - Backend: RabbitMQ for RPC

  Issue:
  neutron-metadata-agent appears as XXX (dead) in `openstack network agent list` despite:
  - Service being active and running (systemctl status shows active)
  - Metadata functionality working correctly for instances
  - [agent] section configured with report_interval = 30
  - log_agent_heartbeats = true shows no actual heartbeat attempts in logs

  Expected: Agent should show :-) (alive) status
  Actual: Agent shows XXX (dead) status

  Configuration tested:
  - Verified RabbitMQ connectivity
  - Confirmed Nova metadata service reachability
  - Checked hostname resolution
  - Verified other agents (L3, DHCP, OVS) report correctly

  This appears to be a state reporting implementation issue specific to
  the metadata agent, as it doesn't seem to be sending RPC heartbeat
  messages despite configuration.

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