*: upgrade zap logger to 1.15, replace global logger

[gyuho]

No description provided.

[jingyih]

Thanks @gyuho! It is unclear to me what is the global zap logger in etcd?

[jingyih]

On another topic related to logger, is it still the plan to deprecate logutil.Logger in v3.5?

etcd/pkg/logutil/logger.go

Lines 20 to 21 in 93cf449

	// TODO: deprecate in v3.5.
	type Logger interface {

[gyuho]

On another topic related to logger, is it still the plan to deprecate logutil.Logger in v3.5?

etcd/pkg/logutil/logger.go

Lines 20 to 21 in 93cf449

	// TODO: deprecate in v3.5.
	type Logger interface {

Yes, I believe this is only needed for gRPC.

[gyuho]

Thanks @gyuho! It is unclear to me what is the global zap logger in etcd?

This means now we don't have to pass around *zap.Logger objects.

Just

zap.L().Info(...)

:)

[jingyih]

Thanks @gyuho! It is unclear to me what is the global zap logger in etcd?

This means now we don't have to pass around *zap.Logger objects.

Just

zap.L().Info(...)

:)

This is awesome!