Just received the following in an email from Magento. This will affect a large number of merchants!

As of July 1, 2019, Magento 2.1.x will no longer be supported. Update now to avoid security risks.

Our records indicate that your organization is still using a 2.2 based version of Magento. Support for Magento 2.2 will end on January 1, 2020. Clients still on this version should upgrade as soon as possible to 2.3, which includes tools to help you supercharge your sales goals before the end of the year.