### API Change

- Protobuf serialization of metav1.MicroTime timestamps (used in `Lease` and `Event` API objects) has been corrected to truncate to microsecond precision, to match the documented behavior and JSON/YAML serialization. Any existing persisted data is truncated to microsecond when read from etcd. ([#111936](https://github.com/kubernetes/kubernetes/pull/111936), [@haoruan](https://github.com/haoruan)) [SIG API Machinery]

### Feature

### API Change

- Protobuf serialization of metav1.MicroTime timestamps (used in `Lease` and `Event` API objects) has been corrected to truncate to microsecond precision, to match the documented behavior and JSON/YAML serialization. Any existing persisted data is truncated to microsecond when read from etcd. ([#111936](https://github.com/kubernetes/kubernetes/pull/111936), [@haoruan](https://github.com/haoruan)) [SIG API Machinery]

### Feature

pkg io/ioutil, func WriteFile(string, []uint8, os.FileMode) error
pkg io/ioutil, var Discard io.Writer
pkg log, const Ldate ideal-int
pkg log, const Llongfile ideal-int
pkg log, const Lmicroseconds ideal-int
pkg log, const Lshortfile ideal-int
pkg log, const LstdFlags ideal-int
pkg log, const Ltime ideal-int
pkg log, func Fatal(...interface{})
pkg log, func Fatalf(string, ...interface{})

pkg io, type ByteWriter interface { WriteByte }
pkg io, type ByteWriter interface, WriteByte(uint8) error
pkg io, var ErrNoProgress error
pkg log, const Ldate = 1
pkg log, const Llongfile = 8
pkg log, const Lmicroseconds = 4
pkg log, const Lshortfile = 16
pkg log, const LstdFlags = 3
pkg log, const Ltime = 2
pkg log/syslog (darwin-386), const LOG_ALERT = 1
pkg log/syslog (darwin-386), const LOG_AUTH = 32