http://shinken.wmflabs.org/problems?search=deployment shows alarms for the deployment-mediawikiXX instances that no more respond to HTTP requests. That causes beta to be unavailable.
From deployment-mediawiki04 syslog, it seems that is logrotate that restarted hhvm but an invalid configuration prevent the service from starting.
```
Nov 16 06:32:45 deployment-mediawiki04 systemd[1]: Stopping HHVM PHP/Hack runtime...
Nov 16 06:33:10 deployment-mediawiki04 diamond[455]: Failed to collect metrics
Nov 16 06:34:10 deployment-mediawiki04 diamond[455]: HTTPError: HTTP Error 503: Service Unavailable
Nov 16 06:34:15 deployment-mediawiki04 systemd[1]: hhvm.service stop-sigterm timed out. Killing.
Nov 16 06:34:15 deployment-mediawiki04 systemd[1]: hhvm.service: main process exited, code=killed, status=9/KILL
Nov 16 06:34:15 deployment-mediawiki04 systemd[1]: Ignoring invalid environment 'RUN_AS_GROUP=www-data
Nov 16 06:34:15 deployment-mediawiki04 systemd[1]: ## Add additional arguments to the hhvm service start up that you can't put in CONFIG_FILE for some reason.
Nov 16 06:34:15 deployment-mediawiki04 systemd[1]: # ADDITIONAL_ARGS=
Nov 16 06:34:15 deployment-mediawiki04 systemd[1]: ': /etc/default/hhvm
Nov 16 06:34:15 deployment-mediawiki04 systemd[1]: Unit hhvm.service entered failed state.
Nov 16 06:34:27 deployment-mediawiki04 kernel: [1242254.202289] hhvm[12342]: segfault at 8 ip 0000000000e6dbb1 sp 00007f7646ff9468 error 4 in hhvm[400000+2500000]
```
Note the segfault.