Usage: fluent-cat [options] <tag>
    -p, --port PORT                  fluent tcp port (default: 24224)
    -h, --host HOST                  fluent host (default: 127.0.0.1)
    -u, --unix                       use unix socket instead of tcp
    -s, --socket PATH                unix socket path (default: /var/run/fluent/fluent.sock)
    -f, --format FORMAT              input format (default: json)
        --json                       same as: -f json
        --msgpack                    same as: -f msgpack
        --none                       same as: -f none
        --message-key KEY            key field for none format (default: message)
        --time-as-integer            Send time as integer for v0.12 or earlier
        --retry-limit N              Specify the number of retry limit (default: 5)
        --event-time TIME_STRING     Specify the time expression string (default: nil)