The leadership
field in your node config file is not mandatory, by default it is set
as follow:
leadership:
log_ttl: 1h
garbage_collection_interval: 15m
log_ttl
describes for how long the node will keep logs of leader events. This is link to the data you receives from the REST leadership logs end point;garbage_collection_interval
describes the interval between 2 garbage collection runs: i.e. when the node removes item logs that have timed out