[FEATURE] should we support jdk21

[xumanbu]

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Describe the feature

The main feature of JDK 21 is reducing thread overhead with virtual threads. We use several thread pools on the server side, like Netty, gRPC, and Flush. Is it necessary to carry out optimization diagnostics for JDK 21?

Motivation

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Describe the solution

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Additional context

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Are you willing to submit PR?

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