This was broken when profiling to graphite was disabled. Ori restored it in https://gerrit.wikimedia.org/r/#/c/222224/ (live next week).
Change 223659 had a related patch set uploaded (by Gergő Tisza):
Update graphite keys in API dashboard
Change 223659 merged by Ori.livneh:
Fix graphite keys in API dashboard
Still not working.
But I guess that isnt important due to https://grafana.wikimedia.org/#/dashboard/db/api-requests
gdash was retired a year and a half ago, so…