Low level details about outbound HTTP requests

One challenge with understanding performance issues in Elastic APM is that outbound HTTP requests are shown as a simple bar representing start and end time, but that omits many details. Additional details like how much of that request was DNS lookup, connection time, SSL handshake, and request body upload and response body download would help us identify networking and environmental issues. New Relic has this level of granularity, and we can see it in browser instrumentation; it'd be nice to have it in Elastic APM as well.