You are oncall on your team's services. No matter how old those are. The frequency depends on your team size, and the level of tickets/incidents depend on the q

You are oncall on your team's services. No matter how old those are. The frequency depends on your team size, and the level of tickets/incidents depend on the quality of the codebase. I have seen everything from one high sev ticket every 2,3 months to constant paging (3am, etc...)