[FR] FR-015: deepflow agent add readiness probe

[zhangfane]

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• I had searched in the issues and found no similar feature requirement.

Description

The agent takes some time to start its internal components and cannot successfully run all of them in an incompatible environment.
We can add a readiness probe so that the user can confirm that the agent is ready to work.

Use case

No response

Related issues

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Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

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[Nick-0314]

DeepFlow agent is deployed in hostnet mode, which is not convenient to listen to the port, and there is no good way to explore the activity. We add some judgments later. If a module is not started, it will log or exit directly.

[sharang]

In 6.3, we will remove the dependency on HostNet, after that we will add probes.