@Nullable
    @JsonInclude(Include.NON_NULL)
    @JsonProperty
    public String alias() {
        return alias;
    }
Returns the alias of the {@link #name()}.
An alias could be set when a {@link StructInfo} has two different names.

<p>For example, if a {@link StructInfo} is extracted from a {@code com.google.protobuf.Message},
the {@link StructInfo#name()} is set to the full name defined in the proto file and the
{@link StructInfo#alias()} is set to the {@linkplain Class#getName() name} of the generated
{@link Class}.
core/src/main/java/com/linecorp/armeria/server/docs/StructInfo.java