See e.g. https://vital-signs.wmflabs.org/#projects=all,ruwiki,itwiki,dewiki,frwiki,enwiki,eswiki,jawiki/metrics=RollingSurvivingNewActiveEditor where the data is missing for enwiki on most days, and on most of the other wikis for at least some.
Note that there are no gaps for big wikis
@Jdforrester-WMF Closing this ticket, consensus among research team is not to use rolling metrics but there are many other metrics available in wikistats 2.0, please take a look for all projects: https://stats.wikimedia.org/v2/#/all-projects
And, as an example of a specific project, spanish wikipedia active editor metrics: https://stats.wikimedia.org/v2/#/es.wikipedia.org/contributing/editors
We will be anouncing the site at some point tomorrow on e-mail first and on social and others later.
Please note that not all metrics can be computed for all projects but many can be so.