Missing service endpoints are in use for Azure PostgreSQL Server, they can impact the availability.
In Azure Console -
In Terraform -
References:
https://azure.microsoft.com/en-in/blog/vnet-service-endpoints-for-azure-database-services-for-mysql-and-postgresql-in-preview/
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/postgresql_virtual_network_rule#ignore_missing_vnet_service_endpoint