2 Answers
Looks like the most recent update was on April 8th, 2020:
https://github.com/gregsramblings/google-cloud-4-words/blob/master/Poster.pdf
Since this is open sourced, anyone can add new features through a PR. If you see something, add it as a suggestion in a PR and I’m sure he can update it or comment on it.
You can know that by going to the Git Repo and taking a look to the commits date. Right now it seems that no updates happens in the last 8 months.
I assume google doesn’t have predefined dead letter concept for storing the poison message But we can create topic to act like DQL https://stackoverflow.com/questions/55568906/what-is-the-equivalent-of-aws-dead-letter-queue-in-google-cloud-platform