Hi!
Wikimetrics https://metrics.wmflabs.org/ development has been frozen since 2017, and we Analytics consider it's time to sunset this tool. Its last day of operation will be March 24th, 2019.
If you're a Wikimetrics user, please consider working with Event Metrics https://eventmetrics.wmflabs.org/, a newer tool that, like Wikimetrics, allows to gather statistics on cohorts of wiki users. It has been running for one year now, has great documentation https://meta.wikimedia.org/wiki/Event_Metrics, and is supported by the Community Tech https://meta.wikimedia.org/wiki/Community_Tech team.
For more information, you can read this Phabricator task https://phabricator.wikimedia.org/T211835. Please, post any questions or comments in there.
Thanks!