Monitoring / Heath Check

[marceloboeira]

Considering that this would be a big part of the infrastructure (getting lots of public requests), it would be interesting to have a health check endpoint, in order to monitor the status. Even more if you consider autoscaling or anything of the sort (knowing when the pod is ready to receive traffic, or if its unhealthy and shouldn't receive much load). e.g.: https://kubernetes.io/docs/tasks/configure-pod-container/configure-liveness-readiness-probes/

For even more control over the infrastructure, sending metrics to statsd would also be really awesome, in order to integrate with something like Datadog and investigate any latency with more precision.

If its something that you guys think its okay I might be willing to work on PR for both.

[zhouzhuojie]

PRs are welcome!

1. for liveness check, if you want to work on it, you can start with the swagger definition of /health endpoint, and then implement it in pkg/handler
2. for statsd, you can take a look at the new relic middleware under config/middleware.go

Thanks!