Best strategy for Temporal server maintaince

Current we have 5 different stacks in total: - DEV, QA, ITG, UAT, PROD

PROD has a separate temporal server, where as all other non-prod stacks have same temporal server. with different name spaces. is it good to have in such a way. or is it good to have separate temporal server for each stack.

That’s probably fine.

If you want more isolation between the environments you can implement a custom authorizer that requires different certs or tokens per namespace: