var (
	ErrUnknownMethod               = errors.New("etcdserver: unknown method")
	ErrStopped                     = errors.New("etcdserver: server stopped")
	ErrCanceled                    = errors.New("etcdserver: request cancelled")
	ErrTimeout                     = errors.New("etcdserver: request timed out")
	ErrTimeoutDueToLeaderFail      = errors.New("etcdserver: request timed out, possibly due to previous leader failure")
	ErrTimeoutDueToConnectionLost  = errors.New("etcdserver: request timed out, possibly due to connection lost")
	ErrTimeoutLeaderTransfer       = errors.New("etcdserver: request timed out, leader transfer took too long")
	ErrTimeoutWaitAppliedIndex     = errors.New("etcdserver: request timed out, waiting for the applied index took too long")
	ErrLeaderChanged               = errors.New("etcdserver: leader changed")
	ErrNotEnoughStartedMembers     = errors.New("etcdserver: re-configuration failed due to not enough started members")
	ErrLearnerNotReady             = errors.New("etcdserver: can only promote a learner member which is in sync with leader")
	ErrNoLeader                    = errors.New("etcdserver: no leader")
	ErrNotLeader                   = errors.New("etcdserver: not leader")
	ErrRequestTooLarge             = errors.New("etcdserver: request is too large")
	ErrNoSpace                     = errors.New("etcdserver: no space")
	ErrTooManyRequests             = errors.New("etcdserver: too many requests")
	ErrUnhealthy                   = errors.New("etcdserver: unhealthy cluster")
	ErrCorrupt                     = errors.New("etcdserver: corrupt cluster")
	ErrBadLeaderTransferee         = errors.New("etcdserver: bad leader transferee")
	ErrClusterVersionUnavailable   = errors.New("etcdserver: cluster version not found during downgrade")
	ErrWrongDowngradeVersionFormat = errors.New("etcdserver: wrong downgrade target version format")
	ErrKeyNotFound                 = errors.New("etcdserver: key not found")
)

type DiscoveryError struct {
	Op  string
	Err error
}