What is 'metric fixation' as described in the article? Why can this be a bad thing?

Article: Muller, J. (2018, January 12). Cure for Our Fixation on Metrics. The Wall Street Journal. https://www.proquest.com/docview/1986682069/fulltext/18B071511A024AB3PQ/2?accountid=25320

Summary: Measuring results is all the rage in organizations, but it is often wrongheaded and counterproductive.

Questions:

1. What is 'metric fixation' as described in the article? Why can this be a bad thing?

2. Which of the suggestions from the article for defining performance metrics is your favorite? Why?