Clarifying what the duties of an On-Call person are supposed to be would be helpful, too. Our "on-call" engineer was originally only supposed to handle system-

Clarifying what the duties of an On-Call person are supposed to be would be helpful, too. Our "on-call" engineer was originally only supposed to handle system-down emergencies, but more and more stuff has continued to pile onto their realm of responsibilities ("Oh, this thing is supposed to happen at 4 AM that no one wants to do? The on-call engineer can handle that!"), to the point that it now feels like an unpaid overtime shift.