YAML: dotted attributes escape sequence

When querying Spring Cloud Config with a dotted YAML attribute, it gets split into multiple lines:

Source file (application.yml):

appName: sample-app
metadata:
  name: ${appName}
  annotations:
    app.acme.com/source: https://github.com/acme/${appName}

Expected output:

appName: sample-app
metadata:
  name: sample-app
  annotations:
    app.acme.com/source: https://github.com/acme/sample-app

Actual output:

appName: sample-app
metadata:
  name: sample-app
  annotations:
    app:
      acme:
        com/source: https://github.com/acme/sample-app

I have tried escaping the dots multiple ways, none of them worked, except for one "hack" workaround:

Source:

metadata:
  name: sample-app
  annotations:
    default:
      app.acme.com/source: https://github.com/acme/sample-app
    double:
      "app.acme.com/source": https://github.com/acme/sample-app
    single:
      'app.acme.com/source': https://github.com/acme/sample-app
    doubleBr:
      "[app.acme.com/source]": https://github.com/acme/sample-app
    singleBr:
      '[app.acme.com/source]': https://github.com/acme/sample-app
    # Working workaround
    hack:
      ${x-dottedAttribute}/source: https://github.com/acme/sample-app
    # Not working workaround
    hackNested:
      ${x-dottAtts.acme}/source: ${x-dottAtts.acme}/source
    # # Not working workaround returning HTTP 400
    # hackList:
    #   ${x-dottAttList[0]}/source: ${x-dottAttList[0]}/source
x-dottAttList:
  - app.acme.com
x-dottAtts:
  acme: app.acme.com
x-dottedAttribute: app.acme.com

Output:

metadata:
  name: sample-app
  annotations:
    default:
      app:
        acme:
          com/source: https://github.com/acme/sample-app
    double:
      app:
        acme:
          com/source: https://github.com/acme/sample-app
    single:
      app:
        acme:
          com/source: https://github.com/acme/sample-app
    hack:
      app.acme.com/source: https://github.com/acme/sample-app
    hackNested:
      acme/source: app.acme.com/source
    doubleBr[app:
      acme:
        com/source]: https://github.com/acme/sample-app
    singleBr[app:
      acme:
        com/source]: https://github.com/acme/sample-app
x-dottAtts:
  acme: app.acme.com
x-dottedAttribute: app.acme.com
x-dottAttList:
  - app.acme.com

I am using the latest Spring Cloud Config version 4.0.4 (using hyness/spring-cloud-config-server:4.0.4-jre17 docker image from dockerhub), Spring Boot v3.1.2, Java 17.0.7, "native" profile.

This might be related to the existing https://github.com/spring-cloud/spring-cloud-config/issues/1595 issue.

Is there a way to "escape" the dots in attribute so that Config Server would not interpret them? Is this expected behavior?

Thank you very much for your help.

Start with the application.yml reproduction against Spring Cloud Config Server using the native profile, and compare it with issue #1595. Verify how dotted annotation keys are transformed and whether the expected output preserves them; done means the supplied example no longer splits the key and the behavior is covered by regression verification.