Also, when a metric becomes a target, it ceases to be a good metric, regardless of its original efficacy. This is widely known as Goodhart's law [0] [0] https:

Also, when a metric becomes a target, it ceases to be a good metric, regardless of its original efficacy. This is widely known as Goodhart's law [0] [0] https://en.wikipedia.org/wiki/Goodhart%27s_law https://en.wikipedia.org/wiki/Goodhart%27s_law