autoscale.tf

resource "azurerm_monitor_autoscale_setting" "this" {
  name                = "autoscale"
  resource_group_name = data.azurerm_resource_group.this.name
  location            = data.azurerm_resource_group.this.location
  target_resource_id  = azurerm_linux_virtual_machine_scale_set.sentry[0].id

  profile {
    name = "defaultProfile"

    capacity {
      default = var.desired_capacity
      minimum = var.min_size
      maximum = var.max_size
    }

    rule {
      metric_trigger {
        metric_name        = "Percentage CPU"
        metric_resource_id = azurerm_linux_virtual_machine_scale_set.sentry[0].id
        time_grain         = "PT1M"
        statistic          = "Average"
        time_window        = "PT5M"
        time_aggregation   = "Average"
        operator           = "GreaterThan"
        threshold          = 80
      }

      scale_action {
        direction = "Increase"
        type      = "ChangeCount"
        value     = "1"
        cooldown  = "PT1M"
      }
    }

    rule {
      metric_trigger {
        metric_name        = "Percentage CPU"
        metric_resource_id = azurerm_linux_virtual_machine_scale_set.sentry[0].id
        time_grain         = "PT1M"
        statistic          = "Average"
        time_window        = "PT5M"
        time_aggregation   = "Average"
        operator           = "LessThan"
        threshold          = 10
      }

      scale_action {
        direction = "Decrease"
        type      = "ChangeCount"
        value     = "1"
        cooldown  = "PT1M"
      }
    }
  }
}