Shinken on labs has monitored probe based on Graphite metrics which probe labmon1001.eqiad.wmnet . Since July 20th ~ 14:10 UTC the /render URL yields a 401 Not authorized which causes all monitoring probe to be in UNKNOWN state.
That breaks monitoring for Puppet freshness, disk free and others.
Example:
UNKNOWN: Got status 401 from the graphite server at http://labmon1001.eqiad.wmnet/render?format=json&from=-10min&target=cvn.cvn-apache8.diskspace.%2A.byte_percentfree
http://shinken.wmflabs.org/service/cvn-apache8/Free%20space%20-%20all%20mounts#impacts
Most probably related to work on T120295: Setup "official labs grafana" instance