Diagnostic Tools in Visual Studio 2017
I just searched for hours for the Diagnostic Tools and did not find them in Visual Studio 2017. There was no menu entry in Debug --> Windows for me.
Finally, I wrote 'Diagnostics' into the Quick Launch bar and Visual Studio offered me to install this missing feature... I guess I forgot to check the tools on first installation!
The selection is a bit hidden, it's in Debug, Windows, Show Diagnostic Tools. It should be with other window settings really to be easily found.