I'm getting this message while testing Hitcounters.
Debug output: [warning] Deprecated PHP entry point used for HitCounters extension. Please use wfLoadExtension instead, see https://www.mediawiki.org/wiki/Extension_registration for more details. [Called from {closure} in /var/www/html/w/extensions/HitCounters/HitCounters.php at line 47] [warning] Deprecated PHP entry point used for MultiBoilerplate extension. Please use wfLoadExtension instead, see ~