| `alertingPreviewUpgrade` | Show Unified Alerting preview and upgrade page in legacy alerting | Yes |
| `alertingQueryOptimization` | Optimizes eligible queries in order to reduce load on datasources | |
| `betterPageScrolling` | Removes CustomScrollbar from the UI, relying on native browser scrollbars | Yes |
| `alertingUpgradeDryrunOnStart` | When activated in legacy alerting mode, this initiates a dry-run of the Unified Alerting upgrade during each startup. It logs any issues detected without implementing any actual changes. | Yes |