What are the `autoupdate` configuration parameters for?

[ArchangelX360]

Digging a bit in the code it seems that PJSON interface has an update key in L25:

update: {
//...
    autoupdate?: {
        rollout?: number;
        debounce?: number;
    };
// ...
};

I can't see any doc about those parameters, and reading the code it seems that:

• rollout has no usage across the update lib
• debounce has no usage across the update lib

Can somebody explain what are those parameters for?