neutron/releasenotes/notes/add-conntrack-workers-89d30...

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---
prelude: >
In order to reduce the time spent processing security group updates in
the L2 agent, conntrack deletion is now performed in a set of worker
threads instead of the main agent thread, so it can return to processing
other events quickly.
upgrade:
- |
On an upgrade, conntrack entries will now be cleaned-up in a worker
thread, instead of in the calling thread.
fixes:
- |
Fixes bug `1745468 <https://bugs.launchpad.net/neutron/+bug/1745468>`_.