The latest versions of moxi have improved proxy-related stats:

telnet 127.0.0.1 11211
stats proxy

Alternatively:

echo "stats proxy" | nc HOST 11211

The above will provide statistics about the moxi proxy itself, not from asking the memcached/membase servers for cluster-wide statistics.

The proxy-related stats can tell you information about the moxi process, including:

The stats proxy output will looks like:

$ echo stats proxy | nc 127.0.0.1 11211
STAT basic:version 1.6.1rc1
STAT basic:nthreads 5
STAT basic:hostname stevenmb.local
STAT memcached:settings:maxbytes 67108864
STAT memcached:settings:maxconns 1024
STAT memcached:settings:tcpport 0
....
STAT 11211:[ <NULL_BUCKET> ]:pstd_stats:tot_upstream_paused 0
STAT 11211:[ <NULL_BUCKET> ]:pstd_stats:tot_upstream_unpaused 0
STAT 11211:[ <NULL_BUCKET> ]:pstd_stats:err_oom 0
STAT 11211:[ <NULL_BUCKET> ]:pstd_stats:err_upstream_write_prep 0
STAT 11211:[ <NULL_BUCKET> ]:pstd_stats:err_downstream_write_prep 0 END

Let's walk through each section.