Service Logs in Azure Web App via Terraform

I spend lot of time to finally setup logs of my web application in Azure correctly.

Mission

After creating my web app. I want to see the logs in "Log Analytics Workspace" > "Logs".
In order to so so, I need first to tell the "App Service Logs" to see my STDOUT and STDERR. This is quite easy in the UI; It is basically just turn the "Application Logging" toggle to "File System".
I want to this but not via UI but via Terraform scripts.

My Problem

Linux WebApp Documentation explains about what logs, application_logs and http_logs do but it does not explicitly say the relationship between them.
It turns out that application_logs needs http_logs to work properly. I was passing ONLY application_logs and it did not have any effect on the toggle in the UI

Solution

Pass both application_logs and http_logs, even if not interested in the http_logs it is required for application logs to work. Likely to be an implementation detail not well documented.

resource "azurerm_linux_web_app" "main" {
  name                = "${var.app_name}-web"
  location            = azurerm_resource_group.main.location
  resource_group_name = azurerm_resource_group.main.name
  service_plan_id     = azurerm_service_plan.main.id

  site_config {
    ...
  }

  app_settings = {
    ...
  }

  identity {
    ...
  }

  logs {
    application_logs {
      file_system_level = "Information"  # Options: Off, Error, Warning, Information, Verbose
    }

    http_logs {
      file_system {
        retention_in_days = 7
        retention_in_mb   = 35
      }
    }

    detailed_error_messages = true
    failed_request_tracing = true
  }
}