[WIP] Add tool observe behavior for stage develop

[wzshiming]

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[k8s-ci-robot]

@wzshiming: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kwok-verify-main	4d6d577	link	true	/test pull-kwok-verify-main

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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