mcstat should list the possible statkeys in help

bash-5.1$ ./mcstat --help

Usage: mcstat [options] statkey ...

Options:

  -h or --host hostname[:port]   The host (with an optional port) to connect to

                                 (for IPv6 use: [address]:port if you'd like to

                                 specify port)

  -p or --port port              The port number to connect to

  -b or --bucket bucketname      The name of the bucket to operate on

  -u or --user username          The name of the user to authenticate as

  -P or --password password      The passord to use for authentication

                                 (use '-' to read from standard input, or

                                 set the environment variable CB_PASSWORD)

  --tls[=cert,key]               Use TLS and optionally try to authenticate

                                 by using the provided certificate and

                                 private key.

  -s or --ssl                    Deprecated. Use --tls

  -C or --ssl-cert filename      Deprecated. Use --tls=[cert,key]

  -C or --ssl-cert filename      Deprecated. Use --tls=[cert,key]

  -4 or --ipv4                   Connect over IPv4

  -6 or --ipv6                   Connect over IPv6

  -j or --json                   Print result as JSON (unformatted)

  -J or --json=pretty            Print result in JSON (formatted)

  -I or --impersonate username   Try to impersonate the specified user

  -a or --all-buckets            Iterate buckets that list bucket returns

  --no-color                     Disable colors

  --help                         This help text

  statkey ...  Statistic(s) to request