SpringBoot Micrometer custom resourceAttributes errors with org.springframework.core.convert.ConverterNotFoundException

Hello, I am currently configuring OpenTelemetry with Micrometer, and it seems we can configure the resourceAttributes. Docs: https://micrometer.io/docs/registry/otlp under 2. Configuring. However, when I'm configuring the following such as,

management:
  endpoints:
    web:
      exposure:
        include: "*"
        exclude: env,beans
  server:
    port: 8081
  otlp:
    metrics:
      export:
        url: http://localhost:4318/v1/metrics
        resourceAttributes: "key=value,service.name=test-service"

and try to boot up the application server, I am getting the following error:

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to bind properties under 'management.otlp.metrics.export.resource-attributes' to java.util.Map<java.lang.String, java.lang.String>:

    Property: management.otlp.metrics.export.resource-attributes
    Value: "key=value,service.name=test-service"
    Origin: class path resource [application.yml] - 39:29
    Reason: org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.String] to type [java.util.Map<java.lang.String, java.lang.String>]

spring boot version: 3.1.1

As a current workaround, I can set the OTEL_SERVICE_NAME for now or leverage common tags such as management.metrics.tags to override it (ref: https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#actuator.metrics.customizing.common-tags).

Comment From: wilkinsona

Assuming that you're trying to set two attributes (key and service.name), your YAML's wrong. It should be:

management:
  otlp:
    metrics:
      export:
        url: http://localhost:4318/v1/metrics
        resourceAttributes:
          key: value
          service.name: test-service