* agent: Improve DNS performance on large clusters [[GH-4036](https://github.com/hashicorp/consul/issues/4036)]
* api: Add support for Prometheus client format in metrics endpoint with `?format=prometheus` (see [docs](https://www.consul.io/api/agent.html#view-metrics)) [[GH-4014](https://github.com/hashicorp/consul/issues/4014)]
* agent: `start_join`, `start_join_wan`, `retry_join`, `retry_join_wan` config params now all support go-sockaddr templates [[GH-4102](https://github.com/hashicorp/consul/pull/4102)]