Puppet on deployment-mediawiki07 was fixed in T190632. However, shinken still complains:

HTTP CRITICAL: HTTP/1.1 500 hphp_invoke - string 'Wikipedia' not found on 'http://en.wikipedia.beta.wmflabs.org:80/wiki/Main_Page?debug=true' - 287 bytes in 0.009 second response time

The hhvm error suggests some file is missing from wmf-config, and indeed it is. It seems deployment-mediawiki07 does not receive code updates like other appservers do. That makes sence, because it's not listed in the dsh groups in hiera.

@Muehlenhoff created this instance; can you tell whether it's intentional that this instance does not get mediawiki updates?