No single team is accountable for these metrics That's the core of the problem: if a maintainable / observable / whatever-able system is a desired goal, some t

No single team is accountable for these metrics That's the core of the problem: if a maintainable / observable / whatever-able system is a desired goal, some team needs to own it (especially in the organizational structure you've described). There are likely already people doing this work in your organization, they're just having to juggle it along with their "on-topic" responsibilities. Find those folks and figure out how to either let them get back to their main job, or make the global concerns their main job.