Is there a mechanism to live reload authentication credentials for interacting with message brokers and databases?

You may want to check https://flink.apache.org/2023/01/20/delegation-token-framework-obtain-distribute-and-use-temporary-credentials-automatically/

Thanks, that does look useful. I use the rabbitmq connectors and Hashicorp vault to provision credentials currently, so I might have to poke around for some inspiration.