[Task] Monitoring indicators support otel format indicator export

[songxiaosheng]

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Apache Dubbo Component

Java SDK (apache/dubbo)

Descriptions

Currently, dubbo indicators support the use of micromter, but do not support the export of otel format. They need to be compatible with the otel format exporter.

Related issues

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[ShenFeng312]

may be we can use export adapter like spring-boot

[ShenFeng312]

https://github.com/spring-projects/spring-boot/blob/main/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/export/otlp/OtlpMetricsExportAutoConfiguration.java

[glmapper]

I would like to take over this task, please assign it to me. @songxiaosheng

[glmapper]

I finished the initial coding and testing, here are my design ideas and some sample data, I hope to submit it to the community and then discuss it together!

1. add new module dubbo-metrics/dubbo-metrics-otlp，the primary purpose is to introduce a dependency

<dependency>
    <groupId>io.micrometer</groupId>
    <artifactId>micrometer-registry-otlp</artifactId>
  </dependency>

2. Same as the default and prometheus, provide OtlpMetricsReporter and OtlpMetricsReporterFactory to support otlp protocol format data.
3. there are no other changes, if you want use otlp, pls config dubbo.metrics.protocol=otlp to appoint you protocol type

consumer site promethues protocol data:

metrics-prometheus.json

consumer site otlp protocol data:
metrics-otlp.json