in Icinga we have a bunch of UNKNOWNs for "HHVM queue size" and "HHVM busy threads"

they are all "UNKNOWN: No valid datapoints found " or "UNKNOWN: More than half of the datapoints are undefined"

this is the same for T92965

https://icinga.wikimedia.org/cgi-bin/icinga/status.cgi?host=all&type=detail&servicestatustypes=8&hoststatustypes=3&serviceprops=2097162&nostatusheader