kolla-ansible/releasenotes/notes/serial-l3-agent-restart-wit...

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---
fixes:
- |
In HA mode, parallel restart of neutron-l3-agent containers will cause
a network outage. Adding routers increases the recovery time. This
release makes restarts serial and adds a user-configurable delay to ensure
each agent is returned to operation before the next one is restarted.
The default value is 0. A nonzero starting value would only result in
outages if the failover time was greater than the delay, which would be
more difficult to diagnose than consistent behaviour.