Tim is working on a new profiler for PHP, since there are issues with xhprof/tideways that really aren't worth dealing with...and that we can do better in profiling. He's written up some details on https://phabricator.wikimedia.org/T205059, and there's some initial code in our Gerrit.
I've done the initial Debian packaging at https://salsa.debian.org/mediawiki-team/php-excimer - my goal will be to have it in NEW by the end of the month.
Aaaand it's in NEW: https://ftp-master.debian.org/new/php-excimer_0.1.0~git20181025.5675679-1.html
It's not very useful yet because there's no MediaWiki integration, but that should be coming soon :-)
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