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We stop polling when we think we have all the paths in an interval. If we think we have all the paths in 3 minutes, we stop polling then instead of continuing for the rest of the 7 minutes in a 10 minute default polling interval.
NetPath needs to pretty consistently find all of the paths in each interval to be able to show a sane picture of how paths are changing. If you only discovered 75% of the paths in each interval, then every interval would report a lot of path changes that aren't really true. To do that, NetPath uses an algorithm to determine how much of the paths we've found; something we call "PathCompletion". We have this value for every interval for every path. To save resources though, we stop trying to find more paths after we reach a certain PathCompletion percentage. By default, it's 95% completion. If an interval does not reach 95%, a warning is shown since the data may not be reliable. You should rarely see this warning. In any case, this gives us pretty fine grained visibility and control.