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Since 1.3.0:
* The Jenkins launcher is replaced with Gearman launcher. An internal
Gearman server is provided, and there is a Gearman plugin for
Jenkins, so migration to the new system should be fairly
straightforward. See the Launchers section of the documentation for
details.
* The custom parameter function signature has changed. It now takes a
QueueItem as the first argument, rather than the Change. The
QueueItem has the full context for why the change is being run
(including the pipeline, items ahead and behind, etc.). The Change
is still available via the "change" attribute on the QueueItem. The
second argument is now the Job that is about to be run, and the
parameter dictionary is shifted to the third position.
* The ZUUL_SHORT_* parameters have been removed (the same
functionality may be achieved with a custom parameter function that
matches all jobs).
* Multiple triggers are now supported (currently Gerrit and a simple
Timer trigger ar supported). Your layout.yaml file will need to
change to add the key "gerrit:" inside of the "triggers:" list to
specify a Gerrit trigger (and facilitate adding other kinds of
triggers later). See the sample layout.yaml and Zuul section of the
documentation.
* The default behavior is now to immediately dequeue changes that have
merge conflicts, even those not at the head of the queue. To enable
the old behavior (which would wait until the conflicting change was
at the head before dequeuing it), see the new "dequeue-on-conflict"
option.
* Some statsd keys have changed in a backwards incompatible way:
* The counters and timers of the form zuul.job.{name} is now split
into several keys of the form:
zuul.pipeline.{pipeline-name}.job.{job-name}.{result}
* Job names in statsd keys now have the '_' character substituted
for the '.' character.
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