dont use pointers when storing metricDefs
dont use pointers when storing metricDefs

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