add note about micrometer

content/en/docs/zero-code/java/spring-boot-starter/_index.md

@@ -23,3 +23,30 @@ OpenTelemetry.
    - **Spring Boot configuration files** (`application.properties`,
      `application.yml`) to configure the OpenTelemetry Spring Boot starter which
      doesn't work with the OpenTelemetry Java agent
+
+## Comparison to Micrometer
+
+At a high level:
+
+OpenTelemetry Spring Boot starter
+
+- Natively uses the OpenTelemetry API, OpenTelemetry SDK and the OpenTelemetry
+  semantic conventions
+- Supported by the OpenTelemetry community (governed by the CNCF / Linux
+  Foundation)
+
+Micrometer [1], [2]
+
+- An independent standalone observability system
+- Offers optional bridges into parts of the OpenTelemetry ecosystem
+- Supported by the Micrometer community (governed by Broadcom Inc)
+
+As the authors of the OpenTelemetry Spring Boot starter, we recommend using the
+OpenTelemetry Spring Boot starter. We have a great community behind it, and are
+continuously making improvements. If you try it out and have any problems or
+suggestions, please open an
+[issue](https://github.com/open-telemetry/opentelemetry-java-instrumentation/issues)
+in our repository.
+
+[1]: https://docs.micrometer.io/micrometer/reference/implementations/otlp.html
+[2]: https://docs.micrometer.io/tracing/reference/tracers.html