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That's one (important) aspect. When looking at a team or individual I check wiki contributions, design documents, commits, code review feedback provided to others, ticket queue depth/volume, "cm" volume, customer forums, broadcast sessions, and org role/level/tenure blend. Also for teams get a referral or just send a "cold" email to have coffee with an IC on the team. I'd hazard that most of those data sources work for most of the teams at Amazon.

This is the correct answer. My advice for amazon SDEs is: either your manager puts operational excellence as their top priority or you need to find a new manager.

Just to elaborate On the priority bit. Page count during on-call rotations is probably a huge metric to watch.