Add information about Grafana Enterprise and plans

Author: maud-lv

articles/managed-grafana/how-to-use-azure-monitor-alerts.md

@@ -15,7 +15,7 @@ In this guide, you learn how to set up Azure Monitor alerts and use them with Az
 Both Azure Monitor and Grafana provide alerting functions.
 
 > [!NOTE]
-> Grafana alerts are only available for instances in the Standard plan.
+> Grafana alerts aren't available in the Essential (preview) plan.
 
 Grafana provides an alerting function for a number of [supported data sources](https://grafana.com/docs/grafana/latest/alerting/fundamentals/data-source-alerting/#data-sources-and-grafana-alerting). Alert rules are processed in your Azure Managed Grafana workspace and they share the same compute resources and query throttling limits with dashboard rendering. For more information about these limits, refer to [performance considerations and limitations](https://grafana.com/docs/grafana/latest/alerting/set-up/performance-limitations/#performance-considerations-and-limitations).
 

articles/managed-grafana/known-limitations.md

@@ -53,6 +53,9 @@ Some Azure Managed Grafana features aren't available in Azure Government and Mic
 
 The following quotas apply to the Essential (preview) and Standard plans.
 
+> [!NOTE]
+> Grafana Enterprise is an option within the Standard plan, not a separate plan within Azure. The information listed below for the Standard plan also applies to Standard instances with Grafana Enterprise enabled.
+
 [!INCLUDE [Azure Managed Grafana limits](../../includes/azure-managed-grafana-limits.md)]
 
 Each data source also has its own limits that can be reflected in Azure Managed Grafana dashboards, alerts and reports. We recommend that you research these limits in the documentation of each data source provider. For instance:

articles/managed-grafana/overview.md

@@ -59,6 +59,9 @@ The [Azure Managed Grafana pricing page](https://azure.microsoft.com/pricing/det
 > [!NOTE]
 > Users can upgrade an instance from Essential (preview) to Standard by going to **Settings** > **Configuration** > **Pricing Plans**. Downgrading from Standard to Essential (preview) however isn't supported.
 
+> [!NOTE]
+> Grafana Enterprise is an option within the Standard plan, not a separate plan within Azure.
+
 ## Quotas
 
 Different quotas apply to Azure Managed Grafana service instances depending on their service tiers. For a list of the quotas that apply to the Essential (preview) and Standard pricing plans, see [quotas](known-limitations.md#throttling-limits-and-quotas).