The reports backing https://pingback.wmflabs.org/#media-wiki-version need to be rerun from 2018-10-24 to correctly populate the MediaWiki version data for MediaWiki 1.33 and later.
The reports backing https://pingback.wmflabs.org/#php-version/php-version-timeseries and the associated drilldown reports need to be rerun from 2018-06-10 to correctly populate PHP version data for PHP 7.3 and later.
See discussion on https://gerrit.wikimedia.org/r/c/analytics/reportupdater-queries/+/545917 and https://gerrit.wikimedia.org/r/c/analytics/reportupdater-queries/+/548306.