First, a big thank you to all pool operators! I recently discovered ntppool and will be adding a server soon.
While playing around with some of the results of querying pool servers I noticed something I was not expecting. I have seen a small number of servers advertise a leap second. For example the following servers are currently advertising a leap second:
pool server reference_clock_identifier_ip
Can somebody explain this to me? Why do they think they should be advertising a leap second?
To be clear I am not seeing an issue with these pool servers, I am merely curious and want to understand how / why this is happening.