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Since 2.0.0:
* The push_change_refs option which specified that Zuul refs should be
pushed to Gerrit has been removed.
* Git merge operations are now performed in a separate process. Run
at least one instance of the ``zuul-merger`` program which is now
included. Any number of Zuul-Mergers may be run in order to
distribute the work of speculatively merging changes into git and
serving the results to test workers. This system is designed to
scale out to many servers, but one instance may be co-located with
the Zuul server in smaller deployments. Several configuration
options have moved from the ``zuul`` section to ``merger``.
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 are 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.
* 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.
* The layout.yaml structure has changed to introduce configurable
reporters. This requires restructuring the start/success/failure
actions to include a dictionary of reporters and their parameters.
See reporters in the docs and layout.yaml-sample.
* The zuul_url configuration option is required in zuul.conf. It
specifies the URL of the git repositories that should be used by
workers when fetching Zuul refs and is passed to the workers as the
ZUUL_URL parameter. It should probably be set to
"http://zuul-host-name/p/".
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