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Plus-equals dog.
Dogstatsd is meant to be a drop-in replacement for Statsd, but there are some differences: 1) The "timing" metric type has been generalized into a "histogram", which is a cleaner conceptual fit for non-time values, e.g. file sizes 2) All metrics can be tagged, and Datadog will allow you to slice graphs and metric names by tag. This replaces the need to interpolate the sender hostname into the metric name. (Also, because the hostname is likely applied by the datadog agent's configuration.) This commit rewrites the output to support these features and depend on the dogstatsd-ruby gem instead of the statsd gem.
Since the dogstatsd-ruby gem authors were too lazy to rename their file from 'statsd.rb' as in the upstream statsd-ruby gem, projects like Logstash which are written in Ruby and could possibly use both have no way to differentiate between them. Luckily, Ruby lets you do whatever you want, but it's pretty gnarly. In this case, it requires a module_eval to properly namespace the Datadog Statsd class.
You can specify the same tag multiple times, e.g. we specify "role:[chef role]" for every role in the node's run list. The syntax should support this.
Upgrade to Logstash 2.0 API
…mespacing hack now that datadog properly namespaces Statsd
Feature/logstash 5
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Add Logstash 6.x version compatibility