> If you yourself struggle to define what 'performance' means in your job, isn't that a red flag all by itself?
No? How do you define the performance of a doctor? Nurse? Teacher? Developer? Tech Support?
Most of these roles have metrics that might seem like easy and foolproof ways to measure performance, but ask anyone that has actually worked any of these professions for more than 2 min, and you'll have endless tails of management fucking everything up by chasing a dumb number.
If your job matters in the slightest, it's not that rare for performance to be wildly elusive to measure.