code: func TagsToFields(ctx context.Context) []zapcore.Field {
  	fields := []zapcore.Field{}
  	tags := grpc_ctxtags.Extract(ctx)
  	for k, v := range tags.Values() {
  		fields = append(fields, zap.Any(k, v))
  	}
  	return fields
  }
docs: // TagsToFields transforms the Tags on the supplied context into zap fields.