kubernetes/vendor/github.com/google/uuid/version4.go

// New creates a new random UUID or panics.  New is equivalent to
// the expression
//
//    uuid.Must(uuid.NewRandom())
func New() UUID { … }

// NewString creates a new random UUID and returns it as a string or panics.
// NewString is equivalent to the expression
//
//    uuid.New().String()
func NewString() string { … }

// NewRandom returns a Random (Version 4) UUID.
//
// The strength of the UUIDs is based on the strength of the crypto/rand
// package.
//
// Uses the randomness pool if it was enabled with EnableRandPool.
//
// A note about uniqueness derived from the UUID Wikipedia entry:
//
//  Randomly generated UUIDs have 122 random bits.  One's annual risk of being
//  hit by a meteorite is estimated to be one chance in 17 billion, that
//  means the probability is about 0.00000000006 (6 × 10−11),
//  equivalent to the odds of creating a few tens of trillions of UUIDs in a
//  year and having one duplicate.
func NewRandom() (UUID, error) { … }

// NewRandomFromReader returns a UUID based on bytes read from a given io.Reader.
func NewRandomFromReader(r io.Reader) (UUID, error) { … }

func newRandomFromPool() (UUID, error) { … }