I didn't pretend to justify adding it because there already exists a precedent.
That said, I've just seen that the `SecurityGroupExtension` already provides several methods to [check the supported features](https://github.com/jclouds/jclouds/blob/master/compute/src/main/java/org/jclouds/compute/extensions/SecurityGroupExtension.java#L162-L181). Perhaps it is not the best mechanism to provide a feature support matrix, but I think that adding the corresponding method to check if the exclusion groups are supported will be consistent with the existing approach and allow users to write portable code without making incorrect assumptions. We can discuss later what would be the best approach to check for supported features, and refactor the existing one, if needed. If you are ok with this, I'll address your comments about the beta annotation and the method name, and add the corresponding "supports" method. WDYT? --- Reply to this email directly or view it on GitHub: https://github.com/jclouds/jclouds/pull/567#issuecomment-58699743
