Logstash + JSON Codec + StatsD

collect.conf

input {
  redis {
    key       => 'logstash:collect'
    data_type => 'list'
    codec     => json
    type      => 'collect'
  }
}
output {
  statsd {
    # Just throw this at the root for now. Sick of expanding graphite trees.
    namespace => ""
    sender => ""

    # Tried with: increment, [increment] ... neither work. Seems that nothing is passed to statsd
    # Tried with: "%{increment}" ... as expected, a concatenated list of arr entries is used as the counter name
    increment => increment
  }
}

input.json

{
  "increment":[
    "metric1",
    "metric2"
  ]
}