static Attributes fromParent(AttributesGetters parent) {
        requireNonNull(parent, "parent");
        return builder(parent).build();
    }
Returns a new {@link Attributes} with the specified parent {@link AttributesGetters}.
The parent {@link AttributesGetters} can be accessed via {@link #attr(AttributeKey)} or {@link #attrs()}.
core/src/main/java/com/linecorp/armeria/common/Attributes.java