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Discover Ludwig"a key metric" is correct and usable in written English.
You can use it to refer to a metric (measurement of a statistic) that is particularly important or relevant for an organization or someone else's understanding of a particular situation. For example, "The company's quarterly sales figures are a key metric when evaluating its performance over the last year."
Exact(60)
This is a key metric.
Indeed, it is being considered a key metric of teaching success.
The conversion rate of the latter wasn't recorded, but that's a key metric.
China's answer to Uber is catching up with its American rival in a key metric: money.
How it is a key metric for whether my family is at risk.
China's investment rate of 48 percent of G.D.P. — a key metric for development — also exceeded India's.
Cookies let online hosts determine the number of unique visitors they reach, a key metric for advertisers.
Average revenue per user, a key metric watched by analysts and investors rose £577, up £29 year on year.
Failure to rescue (FTR) is a key metric of perioperative morbidity and mortality.
Accessibility is a key metric when assessing the efficiency of an urban public transportation network.
In contrast, when it comes to a key metric for electric motors efficiency there's not much room for improvement.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com