lag should only be delay between metric creation and availablity for quering.
lag should only be delay between metric creation and availablity for quering.

issue #39

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