in cluster calls, set user agent
in cluster calls, set user agent

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