replication.go
func (s *followerReplication) LastContact() time.Time {
	s.lastContactLock.RLock()
	last := s.lastContact
	s.lastContactLock.RUnlock()
	return last
}
func (s *followerReplication) LastContact() time.Time {
	s.lastContactLock.RLock()
	last := s.lastContact
	s.lastContactLock.RUnlock()
	return last
}
func ( s * followerReplication ) LastContact ( ) time . Time { s . lastContactLock . RLock ( ) last := s . lastContact s . lastContactLock . RUnlock ( ) return last }
// LastContact returns the time of last contact.
LastContact returns the time of last contact .