Observer or Pub/Sub for dashboard (Springboot)

We have a manufacturing plant and there is a single sql table that is regularly updated with every resource's running job and status. I want to have clients subscribe to changes (by dept) in a web app. (we are building a new microservice architecture for this and other functions). Dept supervisors want to see a "real-time" status of the department's resources and jobs. Probably a total of 20-30 users

Which pattern is best: pub/sub or observable