explain spring boot attribute override

content/en/docs/languages/java/automatic/spring-boot.md

@@ -174,7 +174,9 @@ or the `application.yaml` file, or with environment variables.
 
 ```properties
 otel.propagators=tracecontext,b3
-otel.resource.attributes=environment=dev,xyz=foo
+otel.resource.attributes.deployment.environment=dev
+otel.resource.attributes.service.name=cart
+otel.resource.attributes.service.namespace=shop
 ```
 
 `application.yaml` example:
@@ -186,18 +188,49 @@ otel:
     - b3
   resource:
     attributes:
-      environment: dev
-      xyz: foo
+      deployment.environment: dev
+      service:
+        name: cart
+        namespace: shop
 ```
 
 Environment variables example:
 
 ```shell
 export OTEL_PROPAGATORS="tracecontext,b3"
-export OTEL_RESOURCE_ATTRIBUTES="environment=dev,xyz=foo"
+export OTEL_RESOURCE_ATTRIBUTES="deployment.environment=dev,service.name=cart,service.namespace=shop"
 ```
 
-Disable the OpenTelemetry Starter:
+#### Overriding Resource Attributes
+
+As usual in Spring Boot, you can override properties in the
+`application.properties` and `application.yaml` files with environment
+variables.
+
+For example, you can set or override the `deployment.environment` resource
+attribute (not changing `service.name` or `service.namespace`) by setting the
+standard `OTEL_RESOURCE_ATTRIBUTES` environment variable:
+
+```shell
+export OTEL_RESOURCE_ATTRIBUTES="deployment.environment=prod"
+```
+
+Alternatively, you can use the `OTEL_RESOURCE_ATTRIBUTES_DEPLOYMENT_ENVIRONMENT`
+environment variable to set or override a single resource attribute:
+
+```shell
+export OTEL_RESOURCE_ATTRIBUTES_DEPLOYMENT_ENVIRONMENT="prod"
+```
+
+The second option supports
+[SpEL](https://docs.spring.io/spring-framework/docs/3.2.x/spring-framework-reference/html/expressions.html)
+expressions.
+
+Note that `DEPLOYMENT_ENVIRONMENT` gets converted to `deployment.environment` by
+Spring Boot's
+[Relaxed Binding](https://docs.spring.io/spring-boot/docs/current/reference/html/features.html#features.external-config.typesafe-configuration-properties.relaxed-binding.environment-variables).
+
+#### Disable the OpenTelemetry Starter
 
 {{% config_option name="otel.sdk.disabled" %}}
 

static/refcache.json

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