@Nullable
    default Boolean warnNettyVersions() {
        return null;
    }
Returns whether to log a warning message when any Netty version issues are detected, such as
version inconsistencies or missing version information in Netty JARs.

<p>The default value of this flag is {@code true}, which means a warning message will be logged
if any Netty version issues are detected, which may lead to unexpected behavior. Specify the
{@code -Dcom.linecorp.armeria.warnNettyVersions=false} to disable this flag.</p>
core/src/main/java/com/linecorp/armeria/common/FlagsProvider.java