Provide support for pushing metrics to statsd

[tomkerkhove]

Provide support for pushing metrics to statsd enabled endpoints.

This should be an opt-in in the runtime configuration.

https://github.com/statsd/statsd

Checklist

• Provide support for emitting over statsd
• Provide server configuration where to emit to
• Provide validation for server configuration
• Provide docs on statsd support
• Provide docs on statsd configuration
• Setup local developer experience to emit to graphite

[tomkerkhove]

We need to determine if this should be the same agent or if we need to move this to a new container.

It feels more natural to split them based on the system it supports.