Hello,
The above is an Azure Monitor Alert rule.
Microsoft Sentinel has its own alert system these are called Sentinel Analytic Rules, are normally part of the Sentinel Solution package. Did you mean Sentinel Solution or something else? https://github.com/Azure/Azure-Sentinel/tree/c6dce9c3aa4d4b4d02423ac4eb5a6b677a39e432/Solutions#readme
You can see Analytic Rules listed below in the instructions.
There are options for Azure Monitor deployments here: https://learn.microsoft.com/en-us/azure/azure-monitor/alerts/alerts-manage-alert-rules