MON-489 Add monitor free disk space

cloud/azure/virtual-machine/inputs.tf

@@ -191,4 +191,42 @@ variable "ram_reserved_threshold_critical" {
   default     = 95
 }
 
+variable "filesystem_free_disk_space_low_enabled" {
+  description = "Flag to enable Virtual Machine status monitor"
+  type        = string
+  default     = "true"
+}
 
+variable "filesystem_free_disk_space_low_time_aggregator" {
+  description = "Monitor aggregator for Virtual Machine free disk space [available values: min, max or avg]"
+  type        = string
+  default     = "avg"
+}
+
+variable "filesystem_free_disk_space_low_timeframe" {
+  description = "Monitor timeframe for Virtual Machine free disk space too low [available values: `last_#m` (1, 5, 10, 15, or 30), `last_#h` (1, 2, or 4), or `last_1d`]"
+  type        = string
+  default     = "last_15m"
+}
+
+variable "filesystem_free_disk_space_low_threshold_critical" {
+  description = "Virtual Machine free disk space in percent (critical threshold)"
+  default     = "5"
+}
+
+variable "filesystem_free_disk_space_low_threshold_warning" {
+  description = "Virtual Machine free disk space in percent (warning threshold)"
+  default     = "10"
+}
+
+variable "filesystem_free_disk_space_low_extra_tags" {
+  description = "Extra tags for Virtual Machine free disk space monitor"
+  type        = list(string)
+  default     = []
+}
+
+variable "filesystem_free_disk_space_low_message" {
+  description = "Custom message for Virtual Machine CPU free disk space monitor"
+  type        = string
+  default     = ""
+}

cloud/azure/virtual-machine/monitors-virtual-machine.tf

@@ -134,3 +134,36 @@ EOQ
   }
 }
 
+resource "datadog_monitor" "virtualmachine_free_filesystem_disk_space_low" {
+  count   = var.filesystem_free_disk_space_low_enabled == "true" ? 1 : 0
+  name    = "${var.prefix_slug == "" ? "" : "[${var.prefix_slug}]"}[${var.environment}] Virtual Machine filesystem disk space too low {{#is_alert}}{{{comparator}}} {{threshold}}% ({{value}}%){{/is_alert}}{{#is_warning}}{{{comparator}}} {{warn_threshold}}% ({{value}}%){{/is_warning}}"
+  message = coalesce(var.filesystem_free_disk_space_low_message, var.message)
+  type    = "query alert"
+
+  query = <<EOQ
+    ${var.filesystem_free_disk_space_low_time_aggregator}(${var.filesystem_free_disk_space_low_timeframe}): (
+      avg:azure.vm.builtin_filesystem_percentfreespace${module.filter-tags.query_alert} by {resource_group,region,name}
+    ) < ${var.filesystem_free_disk_space_low_threshold_critical}
+EOQ
+
+  thresholds = {
+    warning  = var.filesystem_free_disk_space_low_threshold_warning
+    critical = var.filesystem_free_disk_space_low_threshold_critical
+  }
+
+  evaluation_delay    = var.evaluation_delay
+  new_host_delay      = var.new_host_delay
+  notify_no_data      = false
+  renotify_interval   = 0
+  notify_audit        = false
+  timeout_h           = 1
+  include_tags        = true
+  locked              = false
+  require_full_window = false
+
+  tags = concat(["env:${var.environment}", "type:cloud", "provider:azure", "resource:virtualmachine", "team:claranet", "created-by:terraform"], var.filesystem_free_disk_space_low_extra_tags)
+
+  lifecycle {
+    ignore_changes = ["silenced"]
+  }
+}