Can Sermant support Prometheus monitoring?

[zwmagic]

What would you like to be added?

It is hoped that Sermant will support Prometheus monitoring so that Sermant's core metrics as well as each plugin's custom metrics can be monitored through Grafana.

Why is this needed?

1. Through integration with Grafana, we can use its rich data visualization capabilities to create intuitive dashboards that can help us quickly locate and solve problems.
2. Through monitoring metrics, monitoring alarms can be added to ensure the stability of sermant.

###Proposal proposal
Regarding the need for Sermant to support Prometheus monitoring, I am currently considering the following three options and hope to discuss them in the community in order to choose the most suitable one or combine it with other more suitable options.

Solution 1: Integrate Micrometer

Advantages: Micrometer provides a common interface integrated with a variety of monitoring systems (including Prometheus), has complete documentation, and is easy to get started.
Disadvantages: need to introduce additional dependencies

Option 2: Use Prometheus’ native API directly

Advantages: Directly use Prometheus native capabilities
Disadvantages: Completely bound to Prometheus

Option 3: Implement custom Metric interface

advantage:

• Provides a flexible and scalable way to customize metrics, easy to implement and maintain
• Compatible with a variety of surveillance systems

shortcoming:

• Additional code needs to be developed to handle indicator registration and exposure
• It may take time for the community to adapt to this new interface

[hanbingleixue]

Currently, the monitoring plug-in supports reporting metrics to Prometheus. The monitoring plugin also supports reporting the metrics information collected by the flow control plugin. You can check the user manual of the monitoring plug-in to see if it meets your requirements. Monitoring plugin manual address: https://sermant.io/zh/document/plugin/monitor.html.

[zwmagic]

Prometheus metrics capabilities can be transferred to core, so that other plugins can also customize metrics.

[daizhenyu]

The Sermant community accepted this issue request and will support Prometheus in monitoring the metrics information of the Sermant framework, plugins, and host microservices in the future.