`/reverse_proxy/upstreams` - all in-flight requests

[matburton]

Issue Details

This is a feature request

The Caddy API exposes a useful /reverse_proxy/upstreams end-point which lists the number of in-flight requests for each upstream address, e.g.:

[
  {
    "address": "something:80",
    "num_requests": 1337,
    "fails": 0
  }
]

When the config changes however, and the upstream address for a reverse_proxy is changed, the previous address is no longer included in the JSON returned by /reverse_proxy/upstreams even if there are outstanding requests that have yet to complete.

It'd be awesome if /reverse_proxy/upstreams could include all in-flight requests even if they are to addresses that are no longer an address in the config.

Doing so would allow the /reverse_proxy/upstreams end-point to be useful to determine when a previous upstream has been completely drained.

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