Nodes stats API CPU usage value is -1

Elastic Stack Elasticsearch
1

Hello, I have a question.
I have installed elasticsearch on azure. OS is Ubuntu.
And look up the cpu usage.
I ran '_cat/nodes?format=json' , and the cpu value is -1.
can not understand.
I browsed the documentation (Nodes stats API | Elasticsearch Guide [8.5] | Elastic)

(integer) Recent CPU usage for the whole system, or -1 if not supported.

In what cases is this not supported?

please answer about my question. thank you.

2

I'll document how I solved it.
It was resolved by changing AdoptOpenJDK to MS OpenJDK and restarting elasticsearch.
My guess is that it's an issue with using azure and AdoptOpenJDK.

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