Usually I hear it in the context of a person outside the team added to an interview panel, to help ensure that the hiring team is adhering to company-wide hiring standards, not the team's own standards, where they may differ.
But in this case I'm guessing their incident analysis teams also get an unrelated person added to them, in order to have an outside perspective? Seems confusing to overload the term like that, if that's the case.
They are the same role different specialties. Like saying SDE for ML or for Distributed Systems or Clients.
you can usually guess from context but what you say is "we need a bar raiser for this hiring loop" or "get a bar raiser for this COE" or "get a bar raiser for the UI", there are qualified bar raisers for each setting.
But in this case I'm guessing their incident analysis teams also get an unrelated person added to them, in order to have an outside perspective? Seems confusing to overload the term like that, if that's the case.