enforce proper stringification of agg method
enforce proper stringification of agg method

plus some minor formatting

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