Introduce deployments to make rolling updates based on allocation health #2799
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This PR: * disallows update stanzas on batch jobs * undeprecates the stagger field * changes the way warnings are returned
…ls based on version
This PR adds rolling node drains done at max_parallel and stagger of the update spec. It brings it inline with old behavior.
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This PR introduces:
deployment.A deployment is created when a job with an update policy is changed. The deployment tracks the desired set of changes and its progress.
Rolling updates now are based on allocation health. The health can be determined by the tasks in the allocation being running and also that the checks registered in Consul are successful.