Complete benchmark task 1 with S model

[NICEHey]

No description provided.

[SteKoe]

Hey @NICEHey,

what's this all about? What is the purpose? Which problem did you solve? What is S model and what is task 1?

[cdprete]

@SteKoe

What is S model and what is task 1?

AI :D

what's this all about? What is the purpose? Which problem did you solve?

According to the comment

// The backend SSE stream re-publishes the new application (with the migrated
// instance) and then the previous application with an empty instance list so
// the store can drop it. The instance's registration.name changes while the
// id/healthUrl stay the same.

I think he's trying to fix the renaming of an application.
What puzzles me is, how is he doing it?. Is he doing it at runtime somehow?
That's the only scenario - in the context of the change - where I think indeed there may be some issues in the current codebase.

Moreover, the model objects should not be changed.
If this is allowed, I would then argue that the suggestion provided in #5416 to just change the status update event to carry also the health groups should have also be applied instead of having yet another cache and another scheduler that take up resources.
But, that suggestion was rejected by @ulischulte exactly because the model should not be touched since it's exposed.