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Sensu memcached metrics triggers error for invalid line in carbon

The sensu metrics memcached plugin by default outputs the memcached version, if you pipe this to graphite this will generate an error:

[listener] invalid line (hostname.memcached.version 1.4.25 1508527659) received from client, ignoring

Using grep to filter it out solves the problem:

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"memcached_metrics": {
    "type": "metric",
    "command": "metrics-memcached-graphite.rb | grep -v memcached.version",
    "subscribers": [
        "memcached"
    ],
    "interval": 60,
    "handlers": ["graphite_tcp"]
}