Update GCP resource detector info (#1237)

Author: psx95

README.md

@@ -15,6 +15,7 @@ feature or via instrumentation, this project is hopefully for you.
 * [zstd Compressor](./compressors/compressor-zstd/README.md)
 * [Consistent Sampling](./consistent-sampling/README.md)
 * [Disk Buffering](./disk-buffering/README.md)
+* [GCP Resources](./gcp-resources/README.md)
 * [JMX Metric Gatherer](./jmx-metrics/README.md)
 * [No-Op API](./noop-api/README.md)
 * [OpenTelemetry Maven Extension](./maven-extension/README.md)

gcp-resources/README.md

@@ -49,6 +49,12 @@ spec:
 Additionally, the container name will only be discovered via the environment variable `CONTAINER_NAME`
 which much be included in the environment.
 
+## Usage with Auto-Instrumentation
+
+With the release of [v2.2.0 of the OpenTelemetry Java Instrumentation](https://github.com/open-telemetry/opentelemetry-java-instrumentation/releases/tag/v2.2.0), the GCP resource detector is now included with the Java agent.
+
+For users of Java Agent v2.2.0 and later, the GCP resource detectors can be enabled by following the instructions provided [here](https://opentelemetry.io/docs/languages/java/automatic/configuration/#enable-resource-providers-that-are-disabled-by-default).
+
 ## Component Owners
 
 - [Josh Suereth](https://github.com/jsuereth), Google