Shows the online peers per crawl by the absolute difference between the time in the version message of a node and the clock of the crawler. Unknown means that the crawler got no time from the node. Select an agent type to see only its nodes.
The 70-minute bucket limit comes from Bitcoin Core releases before 28.0. They warn when the median clock difference to their peers is more than 70 minutes, because a wrong clock can make a node reject valid blocks. Bitcoin Core 28.0 and later warn at more than 10 minutes.
Online peers per clock difference