Information about changes to proxy is now in Github on the Wavefront proxy github page. On that page, you can also see which version of the proxy is GA or a release candidate.
If proxy changes are important for the service, we update relevant pages in this doc set, for example, with new configuration parameters, ports, etc.
This doc set used to include a summary for each release. For older versions of the proxy, this summary information is now in the Wavefront Proxy Release Notes Archive. Going forward, the Github page is the single source of truth.