public Builder addAnnotation(long timestamp, String value) {
      if (annotations == null) annotations = new ArrayList<>(2);
      annotations.add(Annotation.create(timestamp, value));
      return this;
    }
public Builder addAnnotation ( long timestamp , String value ) { if ( annotations == null ) annotations = new ArrayList < > ( 2 ) ; annotations . add ( Annotation . create ( timestamp , value ) ) ; return this ; }
@see Span#annotations