add helpers to get meta tag data structures
add helpers to get meta tag data structures

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