Windows 10, version 1809 users who have recently started receiving update notifications can dismiss them and update at a later time. Microsoft also warned users of Windows 10 version 1703 Enterprise and Education editions to take action since this version will reach end of life on October 9, 2019. Windows 10 May 2019 Update still has eight compatibility holds active for the latest Windows 10 update, but Microsoft provides mitigation measures for some of them. Microsoft released today the optional monthly “D”” release for Windows 10 in the form of the KB4512941 cumulative update with numerous fixes.”
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-says-windows-10-1809-users-can-dismiss-1903-update-alerts/