It was the solution to periodically update Coordinated Universal Time (UTC) due to imprecise observed solar time (UT1) and the long-term slowdown in the Earth’s rotation.
Since 1972 the leap second, UTC has been updated 27 times.
According to Metablog, they support an industry effort to stop future introductions of leap seconds. And they want to stay at a current level of 27.
Introducing new leap seconds or a negative leap second may be risky. Meta researchers want to introduce new technologies to replace it.
