Terraform Azure Metric Alert for MySQL in Azure

I’m having a problem creating metric alerts for a mysql instance using terraform. The error is referencing metric namespaces. I’m wondering if mysql and postgre are not supported with metric namespaces. Here’s an example (edited):

resource "azurerm_mysql_server" "mysql-server" {
    location            =  module.resource-group.location
    resource_group_name = module.resource-group.name
    name                = "test-mysql-monitor"

    administrator_login          = local.administrator_login
    administrator_login_password = local.administrator_password
    sku_name = var.mysql-sku-name
    version  = var.mysql-version

    storage_mb        = var.mysql-storage
    auto_grow_enabled = true

    backup_retention_days        = 7
    geo_redundant_backup_enabled = false

    public_network_access_enabled    = true
    ssl_enforcement_enabled          = true
    ssl_minimal_tls_version_enforced = "TLS1_2"

# Create a MySQL database
resource "azurerm_mysql_database" "mysql-db" {
    name                = "pwtestmsql"
    resource_group_name = module.resource-group.name
    server_name         = azurerm_mysql_server.mysql-server.name
    charset             = "utf8"
    collation           = "utf8_unicode_ci"

# Create an action group
resource "azurerm_monitor_action_group" "azuremag" {
    name                = var.action_group_name
    resource_group_name = azurerm_mysql_database.mysql-db.resource_group_name
    short_name          = var.short_name

    email_receiver {
        name                    = var.receiver_name
        email_address           = var.email_address
        use_common_alert_schema = var.alert_schema

resource "azurerm_monitor_metric_alert" "az_mysql_alert" {
    name                = "Failed Connections"
    resource_group_name = azurerm_mysql_database.mysql-db.resource_group_name
    scopes              = [azurerm_mysql_database.mysql-db.id]
    description         = "An alert rule to watch for failed connections"
    frequency           = "PT5M"

    criteria {
        metric_name      = "connections_failed"
        operator         = "GreaterThan"
        threshold        = 10
        aggregation      = "Average"
        metric_namespace = "Microsoft.DBforMySQL/serversv2"

    action {
        action_group_id = azurerm_monitor_action_group.azuremag.id

I get the following error

Error: Error creating or updating metric alert “Failed Connections” (resource group “app-pwmysql-sandbox-useast2”): insights.MetricAlertsClient#CreateOrUpdate: Failure responding to request: StatusCode=400 – Original Error: autorest/azure: Service returned an error. Status=400 Code=“ResourceNotFound” Message="{“code”:“BadRequest”,“message”:“Detect invalid value: Microsoft.DBforMySQL/serversv2 for query parameter: ‘metricnamespace’, the value must be: Microsoft.DBforMySQL/servers/databases if the query parameter is provided, you can also skip this optional query parameter.”} Activity ID: 517d2151-3672-45cb-aeb7-dc42530aedb6."

I’ve tried using Microsoft.DBforMySQL/servers/databases but that returns an error as well. Here’s a link to the documentation: https://docs.microsoft.com/en-us/azure/azure-monitor/platform/alerts-metric-near-real-time

It looks like there is limited support for some of these resources with metric namespaces, and that might be the problem.