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- Adds new config 'vm.ha.enabled' with Zone scope, to enable/disable VM High Availability manager. This is enable by default (for backward compatibilty). When enabled, the VM HA WorkItems (for VM Stop, Restart, Migration, Destroy) can be created and the scheduled items are executed. When disabled, new VM HA WorkItems are not allowed and the scheduled items are retried until max retries configured at 'vm.ha.migration.max.retries' (executed in case HA is re-enabled during retry attempts), and then purged after 'time.between.failures' by the cleanup thread that runs regularly at 'time.between.cleanup'. - Adds new config 'vm.ha.alerts.enabled' with Zone scope, to enable/disable alerts for the VM HA operations. This is enabled by default.