use time seen in ES as first point, per series
use time seen in ES as first point, per series

instead of start date of the program, which was causing false lag
measurements, when the program started before all metrics were there
but we wanna start the program early precisely because we want to
instrument the number of metrics appearing over time.

for real lag viz, just login as a fake user in devstack and look at the
end of the graphs. or:
curl -H 'X-Org-Id: 2'
'http://localhost:8888/render?format=json&target=litmus.fake_org_1_endpoint_3.dev1.http.wait&from=-30min';
echo; date '+%s'

raintank/metrictank,OOM-Killer/metrictank,OOM-Killer/metrictank,replay/metrictank,replay/metrictank,raintank/raintank-metric,raintank/metrictank,raintank/raintank-metric,raintank/metrictank,raintank/metrictank,raintank/raintank-metric,replay/metrictank,replay/metrictank,OOM-Killer/metrictank