v1.19.0

Enhancements:

• #975: Avoid panicking in Sampler core if the level is out of bounds.
• #984: Reduce the size of BufferedWriteSyncer by aligning the fields
  better.

Thanks to @lancoLiu and @thockin for their contributions to this release.

v1.18.1

Bugfixes:

• #974: Fix nil dereference in logger constructed by zap.NewNop.

v1.18.0

Enhancements:

• #961: Add zapcore.BufferedWriteSyncer, a new WriteSyncer that buffers
  messages in-memory and flushes them periodically.
• #971: Add zapio.Writer to use a Zap logger as an io.Writer.
• #897: Add zap.WithClock option to control the source of time via the
  new zapcore.Clock interface.
• #949: Avoid panicking in zap.SugaredLogger when arguments of *w
  methods don't match expectations.
• #943: Add support for filtering by level or arbitrary matcher function to
  zaptest/observer.
• #691: Comply with io.StringWriter and io.ByteWriter in Zap's
  buffer.Buffer.

Thanks to @atrn0, @ernado, @heyanfu, @hnlq715, @zchee
for their contributions to this release.

v1.17.0

Bugfixes:

• #867: Encode <nil> for nil error instead of a panic.
• #931, #936: Update minimum version constraints to address
  vulnerabilities in dependencies.

Enhancements:

• #865: Improve alignment of fields of the Logger struct, reducing its
  size from 96 to 80 bytes.
• #881: Support grpclog.LoggerV2 in zapgrpc.
• #903: Support URL-encoded POST requests to the AtomicLevel HTTP handler
  with the application/x-www-form-urlencoded content type.
• #912: Support multi-field encoding with zap.Inline.
• #913: Speed up SugaredLogger for calls with a single string.
• #928: Add support for filtering by field name to zaptest/observer.

Thanks to @ash2k, @FMLS, @jimmystewpot, @oncilla, @tsoslow, @tylitianrui, @withshubh, and @wziww for their contributions to this release.

v1.16.0

Bugfixes:

• #828: Fix missing newline in IncreaseLevel error messages.
• #835: Fix panic in JSON encoder when encoding times or durations
  without specifying a time or duration encoder.
• #843: Honor CallerSkip when taking stack traces.
• #862: Fix the default file permissions to use 0666 and rely on the umask instead.
• #854: Encode <nil> for nil Stringer instead of a panic error log.

Enhancements:

• #629: Added zapcore.TimeEncoderOfLayout to easily create time encoders
  for custom layouts.
• #697: Added support for a configurable delimiter in the console encoder.
• #852: Optimize console encoder by pooling the underlying JSON encoder.
• #844: Add ability to include the calling function as part of logs.
• #843: Add StackSkip for including truncated stacks as a field.
• #861: Add options to customize Fatal behaviour for better testability.

Thanks to @SteelPhase, @tmshn, @lixingwang, @wyxloading, @moul, @segevfiner, @andy-retailnext and @jcorbin for their contributions to this release.

v1.15.0

Bugfixes:

• #804: Fix handling of Time values out of UnixNano range.
• #812: Fix IncreaseLevel being reset after a call to With.

Enhancements:

• #806: Add WithCaller option to supersede the AddCaller option. This
  allows disabling annotation of log entries with caller information if
  previously enabled with AddCaller.
• #813: Deprecate NewSampler constructor in favor of
  NewSamplerWithOptions which supports a SamplerHook option. This option
  adds support for monitoring sampling decisions through a hook.

Thanks to @danielbprice for their contributions to this release.

v1.14.1

Bugfixes:

• #791: Fix panic on attempting to build a logger with an invalid Config.
• #795: Vendoring Zap with go mod vendor no longer includes Zap's
  development-time dependencies.
• #799: Fix issue introduced in 1.14.0 that caused invalid JSON output to
  be generated for arrays of time.Time objects when using string-based time
  formats.

Thanks to @YashishDua for their contributions to this release.

v1.14.0

Enhancements:

• #771: Optimize calls for disabled log levels.
• #773: Add millisecond duration encoder.
• #775: Add option to increase the level of a logger.
• #786: Optimize time formatters using Time.AppendFormat where possible.

Thanks to @caibirdme for their contributions to this release.

v1.13.0

Enhancements:

• #758: Add Intp, Stringp, and other similar *p field constructors
  to log pointers to primitives with support for nil values.

Thanks to @jbizzle for their contributions to this release.

v1.12.0

Enhancements:

• #751: Migrate to Go modules.