I have an IFTTT recipe that uses this feed:
https://stackoverflow.com/feeds/tag?tagnames=liquibase&sort=newest
The XML has the name as "Newset" rather than "Newest"
<feed xmlns="http://www.w3.org/2005/Atom" xmlns:creativeCommons="http://backend.userland.com/creativeCommonsRssModule" xmlns:re="http://purl.org/atompub/rank/1.0">
<title type="text">Newset questions tagged liquibase - Stack Overflow</title>
<snip>