[Zeta][System Metrics] improve metrics on k8s

[liunaijie]

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Description

I deploy the seatunnel to k8s, and when i call /hazelcast/rest/maps/system-monitoring-information api to check the system metrics. I find the physical.memory.total is not the pod total memory, it's the pod physical machine memory. Maybe we can improve this to bettle monitor resource usage.

Usage Scenario

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Related issues

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Are you willing to submit a PR?

• [ ] Yes I am willing to submit a PR!

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