We are currently using the JIRA Agile Labs for the "Parallel Sprint" feature and are very exciting and find it useful. We know the huge disclaimer that comes with using a 'lab' and that it is not supported, might not be released, or can be discountinued at anytime.
However, will Atlassian give notice to users or Admins if they do plan on taking away a "lab" in the future? It would be nice if we had some warning beforehand about the Labs being taken away to prepare ourselves.
Its been a while since you posted this question and I have just brought to this from Google, the Agile lab feature is still intact and you can refer to the doco below on how to activate it:
Do write in to support if you find this feature unavailable on your end. Cheers :)
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