I'm currently on-call[...]Not by choice, by necessity. I have no familiarity with the code base, I have little idea what it is doing (and yes, I've asked) It

I'm currently on-call[...]Not by choice, by necessity. I have no familiarity with the code base, I have little idea what it is doing (and yes, I've asked) It sounds like you’re being asked to do a job without the tools you need to do it (i.e. supporting documentation, a runbook etc.). I obviously don’t know the circumstances, but the organisation needs to resolve those issues so you can do an effective job. when the car fails to operate as designed, those people need to figure out why I agree completely. The team responsible for the codebase should be fixing the bugs.