Metrics

There are some obvious but not so obvious questions you want to answer once you go production with a worker

• How long did it take to process a job
• How big are the messages
• How is the message handling looking? how many errors? rejects? accepts? requeues?

It's a pity to redo these every time again, and Sneakers will do it automatically for you in an opinionated (and polite) way

Sneakers::Metrics

The metric variate will be a worker's class name.

• Counter: job start
• Counter: job end
• Counter: message handling and type (ack/reject/etc.)
• Timer: job length
• Timer: message size (to-be-implemented)

So for a worker called LogProcessor, in a StatsD provider, a metric would look like this:

prefix.work.LogProcessor.started.postfix

Given that perfix and postfix are yours to set at the statsd level unrelated to Sneakers. I like to have [environment][product] as prefix and [hostname] as postfix.

Types of Metrics Providers

Right now 3 kinds are baked in, and are configurable to your liking:

• NullMetrics - good when you don't really want metrics, or are doing it custom on your own in the worker body
• StatsdMetrics - good for production use
• LogMetrics - useful to see metrics as they happen as part of logging