Official documentation for TLS version logging.

[bariscaglar]

[shirhatti]

Add docs on consuming CRYPT_* server variables to log TLS version info

[don1941]

When documenting, please try to factor in the popular ASP.Net MVC and ASP.NET WebAPI frameworks and their .NetCore cousins that will want to use these variables at runtime in their controllers and possibly delegatingHandlers, etc. The TLS information is valuable to help identify insecure clients. This information is hard to find but some examples can be found on StackOverflow. For example: https://stackoverflow.com/questions/53461635/how-do-you-check-the-negotiated-tls-handshake-from-the-server/53485283