These are the versions we currently support and use. We know there are issues we need to address with newer versions of Postgres so that’s definitely not supported: Roadmap PostgreSQL Update
Same with Clickhouse: Support for Clickhouse 21.x - #7 by fpacifici (you found this already)
Symbolicator should already be on latest: onpremise/.env at aea6adc5b870da83c9188f672ead1a4d459683fc · getsentry/onpremise · GitHub
Memcached is probably fine (you can try submitting a PR to the repo and we’ll see if the tests fail).
Redis, I have no idea. If they don’t have breaking changes, it would work. Otherwise it would probably fail.
Re Kafka and ZK: we use the Confluent images and this page suggests it is safe to upgrade: Upgrade Confluent Platform | Confluent Documentation
As with others, you may submit a PR, we’ll see if the CI passes and will merge after.
/cc @fpacifici if you have any thoughts.