dcs-web: log finished queries to InfluxDB
dcs-web: log finished queries to InfluxDB

We cannot easily export this via the varz interface, so we push points
into this timeseries from dcs-web.

lamby/dcs,lamby/dcs,jamessan/dcs,lamby/dcs,jamessan/dcs,jamessan/dcs,jamessan/dcs,lamby/dcs