The README.md files in the google-cloud-java monorepo to have instructions about how to use the Libraries BOM. This is part of b/274518727.

How I confirmed the change

I built the Docker image:

suztomo@suztomo:~/synthtool$  docker build -f docker/owlbot/java/Dockerfile .
...
Successfully built d50554d0e398

Checked with google-cloud-java repository

In google-cloud-java clone, I touched different Java files in java-api-gateway, java-language and java-notification.

for M in java-api-gateway java-language java-notification; do
   echo "" >> $(find $M -name '*.java' |head -1)
done

git commit -a -m 'chore: touch files to invoke OwlBot post processor'

Then I ran the code with google-cloud-java repository:

suztomo@suztomo:~/google-cloud-java$ docker run --rm -v $(pwd):/workspace  fd14d77283ae

The three modules got the channge in their README files googleapis/google-cloud-java#9299. Notice the README files have Libraries BOM instruction now.

Checked with java-storage repository

The change worked as expected for java-storage module:

suztomo@suztomo:~/java-storage$ docker run --rm -v $(pwd):/workspace d50554d0e398
...

This actually fixes an existing bug where it wasn't adding <!-- {x-version-update-start:google-cloud-storage:released} --> when a repository has snippet for Libraries BOM usage.