code: @Bean
  	@ConditionalOnMissingBean
  	@Deprecated
  	BytesEncoder<Span> spanBytesEncoder(ZipkinProperties zipkinProperties) {
  		return zipkinProperties.getEncoder();
  	}
docs: Only used for creating a reporter bean with the method above.
  @param zipkinProperties zipkin properties
  @return bytes encoder
  @deprecated left for backwards compatibility