add benchmark for adding & deleting meta records
add benchmark for adding & deleting meta records

raintank/metrictank,raintank/raintank-metric,raintank/metrictank,raintank/raintank-metric,replay/metrictank,replay/metrictank,raintank/metrictank,replay/metrictank,raintank/metrictank,replay/metrictank,raintank/raintank-metric