Namespace must be defined to use Custom Metrics

Question

I am trying to deploy Memory metric which comes under guest metrics for a VM using Terraform, I have already defined namespace for the metric that I am using but its throwing below error.

Error creating or updating metric alert "Memory Usage Alert" (resource group "MyTemp"): insights.MetricAlertsClient#CreateOrUpdate: Failure responding to request: StatusCode=400 -- Original Error: autorest/azure: Service returned an error. Status=400 Code="BadRequest" Message="The following metric name(s) were not found: Memory\% Committed bytes in use. Please note that for custom metrics, the relevant metric namespace must be specified.

resource "azurerm_monitor_metric_alert" "myalert" {
  name                      = "Memory Usage Alert"
  resource_group_name       = var.rg_name //resource name to which you want to deploy this alert
  scopes                    = [var.virtual_machine_id]
  description               = "Action will be triggered when Memory Utilzation count is greater than 85."
  target_resource_type      = "Microsoft.Compute/virtualMachines"
  target_resource_location  = "centralindia"
  frequency                 = "PT30M"
  window_size               = "P1D"
  severity                  = "2"
  enabled                   = "true"

  criteria {
    metric_namespace = "azure.vm.windows.guestmetrics"
    metric_name      = "Memory\% Committed bytes in use"
    aggregation      = "Average"
    operator         = "GreaterThanOrEqual"
    threshold        = 85
  }

  action {
    action_group_id = var.action_name
  }
}

Jim Xu · Accepted Answer

Regarding the issue, you can refer to the following script

Send Azure guest VM metrics to Azure monitor with Azure Diagnostics VM extension. For more details, please refer to here and here

resource "random_string" "password" {
  length  = 16
  special = false
}
data  "azurerm_resource_group" "mygroup" {
  name     = var.resource_group_name
}
resource "azurerm_storage_account" "account" {
  name                     = "myaccount1458975"
  resource_group_name      = data.azurerm_resource_group.mygroup.name
  location                 = data.azurerm_resource_group.mygroup.location
  account_tier             = "Standard"
  account_replication_type = "GRS"
}
resource "azurerm_virtual_machine_extension" "vmextension" {
  name                       = random_string.password.result
  virtual_machine_id         = < your VM id>
  publisher                  = "Microsoft.Azure.Diagnostics"
  type                       = "IaaSDiagnostics"
  type_handler_version       = "1.11"
  auto_upgrade_minor_version = true
   depends_on = [
      azurerm_storage_account.account
   
  ]
  settings = <


Please note that before running the script, you need to enable Azure MSI and boot_diagnostics in your VM

Create Metric Alert

resource "azurerm_monitor_metric_alert" "myalert" {
  name                     = "myalert"
  resource_group_name      = var.resource_group_name
  scopes                   = [var.virtual_machine_id]
  description              = "Action will be triggered when Memory Utilzation count is greater than 85."
  severity                 = "2"
  enabled                  = "true"
  frequency                = "PT1M"
  window_size              = "PT5M",
  target_resource_type     = "Microsoft.Compute/virtualMachines"
  target_resource_location = "japaneast"

  criteria {
    metric_namespace = "azure.vm.windows.guestmetrics"
    metric_name       = "Memory\% Committed bytes in use"
    aggregation       = "Average"
    operator          = "GreaterThanOrEqual"
    threshold         = 85

   
  }

  action {
    action_group_id = var.action_group_name
  }
}

Namespace must be defined to use Custom Metrics

Answers (1)

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