replication.go
func (s *followerReplication) setLastContact() {
	s.lastContactLock.Lock()
	s.lastContact = time.Now()
	s.lastContactLock.Unlock()
}
func (s *followerReplication) setLastContact() {
	s.lastContactLock.Lock()
	s.lastContact = time.Now()
	s.lastContactLock.Unlock()
}
// setLastContact sets the last contact to the current time.