Merge "Document zuul rate limiting configuration"
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@ -422,6 +422,51 @@ explanation of each of the parameters::
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lower. The value should be one of ``high``, ``normal``, or ``low``.
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Default: ``normal``.
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**window**
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DependentPipelineManagers only. Zuul can rate limit
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DependentPipelineManagers in a manner similar to TCP flow control.
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Jobs are only started for changes in the queue if they sit in the
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actionable window for the pipeline. The initial length of this window
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is configurable with this value. The value given should be a positive
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integer value. A value of ``0`` disables rate limiting on the
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DependentPipelineManager.
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Default: ``20``.
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**window-floor**
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DependentPipelineManagers only. This is the minimum value for the
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window described above. Should be a positive non zero integer value.
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Default: ``3``.
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**window-increase-type**
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DependentPipelineManagers only. This value describes how the window
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should grow when changes are successfully merged by zuul. A value of
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``linear`` indicates that ``window-increase-factor`` should be added
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to the previous window value. A value of ``exponential`` indicates
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that ``window-increase-factor`` should be multiplied against the
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previous window value and the result will become the window size.
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Default: ``linear``.
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**window-increase-factor**
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DependentPipelineManagers only. The value to be added or mulitplied
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against the previous window value to determine the new window after
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successful change merges.
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Default: ``1``.
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**window-decrease-type**
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DependentPipelineManagers only. This value describes how the window
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should shrink when changes are not able to be merged by Zuul. A value
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of ``linear`` indicates that ``window-decrease-factor`` should be
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subtracted from the previous window value. A value of ``exponential``
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indicates that ``window-decrease-factor`` should be divided against
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the previous window value and the result will become the window size.
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Default: ``exponential``.
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**window-decrease-factor**
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DependentPipelineManagers only. The value to be subtracted or divided
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against the previous window value to determine the new window after
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unsuccessful change merges.
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Default: ``2``.
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Some example pipeline configurations are included in the sample layout
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file. The first is called a *check* pipeline::
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