[Bug] summit job failed after enabling Prometheus

[dockerzhang]

What happened

What you expected to happen

summit job successfully after enabling Prometheus

How to reproduce

enable agent.prometheus.enable and summit a job.

Environment

No response

InLong version

master

InLong Component

InLong Agent, Other for not specified component

Are you willing to submit PR?

• Yes, I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[dockerzhang]

@shink PTAL

[shink]

It seems that this is because these metrics belong to instances rather than classes, so they will be registered repeatedly when creating multiple instances. A simple solution is to make these metrics static.

https://github.com/apache/incubator-inlong/blob/ea29797d36526f735fd7e7e4fa506430b4e79b1e/inlong-agent/agent-plugins/src/main/java/org/apache/inlong/agent/plugin/metrics/SourcePrometheusMetrics.java#L31-L39