zuul/releasenotes/notes/playbook-semaphore-0dc1ee61...

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---
features:
- |
Individual playbooks may now be wrapped by a semaphore. Zuul will
start the job and proceed up to the point of a playbook which
requires a semaphore and then wait until it is able to aquire the
semaphore before proceeding. It releases the semaphore after the
end of that individual playbook.
The same semaphore may be used for both jobs and playbooks, but an
individual job may not use the same semaphore for both purposes.