Support for flex consumption in azurerm_service_plan and related resources

[audunsolemdal]

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Description

Flex Consumption plans are now in public preview, would like support for these resources without using the azapi provider.

I believe the service_plan validation must allow the "FC1" sku_name, apart from that we need new optional attributes om the azurerm_linux_function_app and azurerm_windows_function_app

Attributes should be available in the following ARM template versions
Microsoft.Web/serverfarms@2023-12-01
Microsoft.Web/sites@2023-12-01

New or Affected Resource(s)/Data Source(s)

azurerm_service_plan azurerm_linux_function_app azurerm_windows_function_app

Potential Terraform Configuration

resource "azurerm_service_plan" "example" {
  name                = "example"
(...)
  sku_name            = "FC1"
}

resource "azurerm_x_function_app" "example" {
  name                = "example-windows-function-app"
(..)
  scale_and_concurrency = { # optional
    maximum_instance_count = #1 to 1000?  # "Scale out further – The default scale limit set by client tools is 100, but this can be changed up to 1000 instances per app"
    instance_memory_mb = # 2048 or 4096 supported
  },
}

References

https://techcommunity.microsoft.com/t5/apps-on-azure-blog/announcing-public-preview-of-azure-functions-flex-consumption/ba-p/4139028
https://github.com/Azure-Samples/azure-functions-flex-consumption-samples/blob/main/IaC/terraform/main.tf

[xiaxyi]

Thanks @audunsolemdal for raising this issue, let me check the feature and add it into our backlog accordingly.

[kl-aayush]

Any Update regarding when this feautre might be added @xiaxyi

[s-nakagaki]

The premium sku is so expensive for micro-architecture. We really want Flex Consumption plan so much.

[oWretch]

Above PR adds support for the Flex Consumption plan. The Maximum Instance Count property on the function app is supported (app_scale_limit) but the Instance Memory property not exposed in the Azure API yet - we need a new preview API for this.