| Interface | Description | 
|---|---|
| UpgradeAdminService | 
 Abstraction for executing the stages of the upgrade process. 
 | 
| UpgradeEventListener | 
 Upgrade event listener. 
 | 
| UpgradeService | 
 Upgrade service. 
 | 
| Class | Description | 
|---|---|
| Upgrade | 
 Represents the state of an upgrade. 
 | 
| UpgradeEvent | 
 Upgrade event. 
 | 
| Enum | Description | 
|---|---|
| Upgrade.Status | 
 Represents the phase of the upgrade protocol. 
 | 
| UpgradeEvent.Type | 
 Type of upgrade-related events. 
 |