How can I create the specific group called "All AD Servers" Group which contains all of my Active Directory Domain Controllers?
So I can select it from the above drop-down every time I set up my Application Monitor template.
Thanks in advance.
You will need to add a Custom Property for it to appear in that specific drop-down list, that may not be the best approach. There are other ways to accomplish what you are looking for.
For example, you can create a Group and automatically apply the AD Lockout Monitor to it. This is the official documentation to accomplish this. Assign a SAM application monitor template to groups of nodes (solarwinds.com)
cool, thanks @steven