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Are 3d party CIs affected by this change and if yes how?
What's the recommendation for newly created 3rd party CIs - should they 
use new zuul only or it's fine to use existing (and tested) jenkins+zuul 
configuration?

Second question - if jobs are to be launched by zuul+ansible, how will 
the worker host be chosen, by ansible-launcher? (normally as I 
understand Jenkins master takes care of deciding which hosts are free to 
run jobs)
Are there any specs about way of managing workers (adding/removing, 
setting # of executors)?

Thank you.

-marek

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Marek Zawadzki
Mirantis Containerized Control Plane Team