[dwedge]

That sounds more like a disaster waiting to happen than a junior. I find it difficult to believe that she didn't know the purpose of the healthcheck, so it sounds like breaking (someone else's problem) instead of addressing gaps in ability

[Cthulhu_]

The junior part there is that this person still believes they can / should read and comprehend all logs themselves. This just isn't viable at scale.

But same with code itself, a junior will have code that is "theirs", a medior/senior will (likely) work at scales where they can't keep it all in their heads. And that's when all the software development best practices come into play.