[feature] Implement Azure Monitor - Service Health Alerts

[benhurjoel]

Is your feature request related to a problem? Please describe.
Would like to add a feature enhancement of Monitoring Module in to the CAF Foundations. The Module may include the monitoring and alerts elements that may be needed in the Landing Zone.

Describe the solution you'd like

Planned inclusion:

landingzone_caf_foundations
|_ blueprint_foundations_monitoring --> New
|_ Service health Alerts

An alert/set of alerts to be triggered in the event of :

• Service Issue (Global and Region wide)
• Planned maintenance
• Health Advisories
• Security Advisories

Components to be created:

• An action group.
• Set of alert rules

Pseudo Code
resource "azurerm_monitor_action_group" "ag1" {
name = var.name
resource_group_name = var.rg
short_name = var.shortname
enabled = #boolean_value from variable set

dynamic "email_receiver" {
for_each = enable_email_alert == false ? [] : [1] # decider from variable set
content {
#from variable set
}
}

dynamic "sms_receiver" {
for_each = enable_sms_alert == false? [] : [1] # decider from variable set
content {
#from variable set
}
}

dynamic "webhook_receiver" {
for_each = enable_webhook_trigger == false ? [] : [1] # decider from variable set
content {
#from variable set
}
}

dynamic "arm_role_receiver" {
for_each = enable_arm_role_alert == false ? [] : [1] # decider from variable set
content {
#from variable set
}
}

}

#Due to the current limitations of 'azurerm_monitor_activity_log_alert' Resource, implementing this alert using ARM Template.

resource "azurerm_template_deployment" "alert1" {
name = "random_name"
resource_group_name = var.rg

template_body = file("${path.module}/filename.json")
parameters = {
"name" = "name"
"actionGroups_name" = azurerm_monitor_action_group.ag1.name
"region" = "${join(",", var.alert_settings.service_health_alerts.location)}" #from variable set
}
deployment_mode = "Incremental"

}

Reference
hashicorp/terraform-provider-azurerm#7392
https://docs.microsoft.com/en-us/azure/service-health/service-health-overview
https://www.terraform.io/docs/providers/azurerm/r/monitor_activity_log_alert.html

[arnaudlh]

This has been added to core module - need to implement into ALZ scenario.