I get the feeling that Microsoft has a lot of these things, but they're disparate.

e.g. code navigation [1], search [2] and CodeLens [3].

[1] https://referencesource.microsoft.com/#mscorlib/system/strin...

[2] https://www.visualstudio.com/en-us/docs/search/code/advanced...

[3] https://msdn.microsoft.com/en-us/library/dn269218.aspx