Client is planning to move to latest Pega version 7.2 for some of their existing applications in 6.x. Client already has some applications running on 7.1.x version in production. Clients requirement is post upgrade they want to use a single SMA to able to monitor all environments, both 7.2 and 7.1.x environments.
Is possible to add new upgraded 7.2 environment related nodes to existing 7.1.x SMA or vice versa (add 7.1.x nodes to 7.2 SMA) with current Pega Product or we will have to maintain all version specific SMAs separately.
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If all your systems are 7.1.x, there is a good chance this may work. However, it is NOT something pega tested (or officially support). So yes, you can try but it may have some issues. I would try to deploy the latest SMA from 7.2+.