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cf7d752453
Add `account.maxRegisteredMachines` config option to cap the number of registered machines. The provision handler atomically checks the limit under a mutex before creating new Link resources, returning ResourceExhausted when the cap is reached. Introduce a Notification resource type (ephemeral namespace) so controllers can surface warnings to users. `omnictl` displays all active notifications on every command invocation. Frontend part of showing notifications will be implemented in a different PR. MachineStatusMetricsController creates a warning notification when the registration limit is reached and tears it down when it's not. Signed-off-by: Oguz Kilcan <oguz.kilcan@siderolabs.com>