These should help -
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Command Central is your out-of-the-box answer, available for free since you’re a customer
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Combine it with the Admin API (see page 991 here) for the low-level items such as JDBC connections, triggers, etc.
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For the IS cluster, I assume you use Terracotta Big Memory, so it comes with a console named Terracotta Management Console
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If you want to delve into the JVM, you can use jvisualvm and other tools that ship with the JVM (see your installation)
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For sake of completeness, there are third-party commercial products available as well
Note - Take a look at this post for more options (link).
KM