Eclipse MicroProfile Health monitor

[skaempfe]

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🏷️ Feature Request Type

New Monitor

🔖 Feature description

Adding "MicroProfile Health Check" as a new "specific monitor type".
The HTTP Request responds with a JSON, representing an application server with deployed applications. The response can be evaluated to get a detailed Overview of possible problems and their root cause.

✔️ Solution

I have implemented the feature and will provide a pull request shortly for further inspection.

❓ Alternatives

I have considered using the "HTTP keyword" monitor but in case of a "DOWN" not enough information can be extracted so extra steps are necessary to obtain the real cause. I want to shortcut these extra steps to improve response time.

📝 Additional Context

from Eclipse MicroProfile Health:

Motivation

Health checks are used to probe the state of a computing node from another machine (i.e. kubernetes service controller) with the primary target being cloud infrastructure environments where automated processes maintain the state of computing nodes.

In this scenario, health checks are used to determine if a computing node needs to be discarded (terminated, shutdown) and eventually replaced by another (healthy) instance.

It’s not intended (although could be used) as a monitoring solution for human operators.

Eclipse MicroProfile Health - Protocol and Wireformat