<quote name="Greg Grossmeier" date="2016-09-20" time="15:29:30 -0700">
In an effort to reduce surprises and potential mishaps it is now required to include any long running tasks in the deployment calendar[0].
To clarify: This does *not* mean that no other deploys can happen at the same time. Other deploys *can* happen (as they did before), but this provides a method for those running the long running tasks to communicate to deployers and vice-versa.
Deployers/those running the long running task are encouraged to use the "Changes" section of the deployment calendar to communicate any gotchas or other information valuable to other deploys/opsen.
Of course, if the long running task does imply no other deploys (not terribly common) then that would be coordinated appropriately.
Greg