iOS System Monitoring Apps

Recently, I experienced an installation hang on my iPad while installing the 3.5.8 1Password Pro update. I posted in the iOS forum, and khad responded that he'd seen similar hangs with other apps. In addition, among other possibilities, he hinted that it could be due to low memory conditions (1Password Pro Install Issue).

I would like to know what, if any, iOS system monitoring apps, or methods, AWS team and Forum members recommend. I would appreciate your thoughts.

Thanks.
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