My biggest problem with Rancher fleet currently is that when something doesn't work, it's very hard to locate an error message telling you what actually is holding things up. You might see the fleet agent giving a 401, or a bunch of resources in state "missing", while they are definitely in the gitops repo.

But to list some others:

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It tries to figure out what the applied resources should look like but it can't account for things like mutating webhooks so it's almost always wrong, and when that happens the bundles go into state "modified" which makes it look like something is wrong. I suspect this could be fixed by doing a server-side apply, or just not peering as deeply into applied yamls as it does.

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