data "template_file" "filter" {
  template = "$${filter}"

  vars {
    filter = "${var.filter_tags_use_defaults == "true" ? format("dd_monitoring:enabled,dd_aws_linux:enabled,env:%s", var.environment) : "${var.filter_tags_custom}"}"
  }
}

resource "datadog_monitor" "datadog_cpu_too_high" {
  name    = "[${var.environment}] CPU High {{comparator}} {{#is_alert}}{{threshold}}%{{/is_alert}}{{#is_warning}}{{warn_threshold}}%{{/is_warning}} ({{value}}%)"
  message = "${var.message}"

  query = <<EOF
    min(last_15m): (
      avg:system.cpu.system{${data.template_file.filter.rendered}} by {region,host} +
      avg:system.cpu.user{${data.template_file.filter.rendered}} by {region,host}
    ) > ${var.cpu_high_threshold_critical}
  EOF

  type = "metric alert"

  thresholds {
    warning  = "${var.cpu_high_threshold_warning}"
    critical = "${var.cpu_high_threshold_critical}"
  }

  tags = ["env:${var.environment}", "type:system"]

  notify_no_data      = true
  evaluation_delay    = "${var.evaluation_delay}"
  new_host_delay      = "${var.evaluation_delay}"
  notify_audit        = false
  timeout_h           = 0
  include_tags        = true
  locked              = false
  require_full_window = true
  no_data_timeframe   = 20
}

resource "datadog_monitor" "datadog_free_disk_space_too_low" {
  name    = "[${var.environment}] Free disk space {{comparator}} {{#is_alert}}{{threshold}}%{{/is_alert}}{{#is_warning}}{{warn_threshold}}%{{/is_warning}} ({{value}}%)"
  message = "${var.message}"

  query = <<EOF
    sum(last_5m): (
      avg:system.disk.free{${data.template_file.filter.rendered}} by {region,host,device} /
      avg:system.disk.total{${data.template_file.filter.rendered}} by {region,host,device} * 100
    ) < ${var.free_disk_space_threshold_critical}
  EOF

  type = "metric alert"

  thresholds {
    warning  = "${var.free_disk_space_threshold_warning}"
    critical = "${var.free_disk_space_threshold_critical}"
  }

  tags = ["env:${var.environment}", "type:system"]

  notify_no_data      = true
  evaluation_delay    = "${var.evaluation_delay}"
  new_host_delay      = "${var.evaluation_delay}"
  notify_audit        = false
  timeout_h           = 0
  include_tags        = true
  locked              = false
  require_full_window = true
  no_data_timeframe   = 20
}

resource "datadog_monitor" "datadog_free_disk_space_inodes_too_low" {
  name    = "[${var.environment}] Free disk inodes {{comparator}} {{#is_alert}}{{threshold}}%{{/is_alert}}{{#is_warning}}{{warn_threshold}}%{{/is_warning}} ({{value}}%)"
  message = "${var.message}"

  query = <<EOF
    sum(last_5m): (
      avg:system.fs.inodes.free{${data.template_file.filter.rendered}} by {region,host,device} /
      avg:system.fs.inodes.total{${data.template_file.filter.rendered}} by {region,host,device} * 100
    ) < ${var.free_disk_inodes_threshold_critical}
  EOF

  type = "metric alert"

  thresholds {
    warning  = "${var.free_disk_inodes_threshold_warning}"
    critical = "${var.free_disk_inodes_threshold_critical}"
  }

  tags = ["env:${var.environment}", "type:system"]

  notify_no_data      = true
  evaluation_delay    = "${var.evaluation_delay}"
  new_host_delay      = "${var.evaluation_delay}"
  notify_audit        = false
  timeout_h           = 0
  include_tags        = true
  locked              = false
  require_full_window = true
  no_data_timeframe   = 20
}

resource "datadog_monitor" "datadog_free_memory" {
  name    = "[${var.environment}] Free memory {{comparator}} {{#is_alert}}{{threshold}}%{{/is_alert}}{{#is_warning}}{{warn_threshold}}%{{/is_warning}} ({{value}}%)"
  message = "Debugging alert - no escalation"

  query = <<EOF
    sum(last_1m): (
      avg:system.mem.free{${data.template_file.filter.rendered}} by {region,host} /
      avg:system.mem.total{${data.template_file.filter.rendered}} by {region,host} * 100
    ) < ${var.free_memory_threshold_critical}
  EOF

  type = "metric alert"

  thresholds {
    warning  = "${var.free_memory_threshold_warning}"
    critical = "${var.free_memory_threshold_critical}"
  }

  tags = ["env:${var.environment}", "type:system"]

  notify_no_data      = true
  evaluation_delay    = "${var.evaluation_delay}"
  new_host_delay      = "${var.evaluation_delay}"
  renotify_interval   = 0
  notify_audit        = false
  timeout_h           = 0
  include_tags        = true
  locked              = false
  require_full_window = true
  no_data_timeframe   = 20
}

# resource "datadog_monitor" "datadog_cpu_load" {
#   name    = "CPU Load > 2"
#   message = "Debugging alert - no escalation"


#   query = "min(last_5m):avg:system.load.5{dd_monitoring:enabled,dd_linux_basics:enabled,!dd_custom_cpu:enabled} by {instance-id} / avg:gcp.gce.instance.cpu.reserved_cores{*} by {instance-id} > 2"
#   type  = "query alert"
#   count = "${var.dd_linux_basics == "enabled" ? 1 : 0}"


# notify_no_data      = "${var.linux_basics_config["notify_no_data"]}"
# evaluation_delay    = "${var.linux_basics_config["delay"]}"
# new_host_delay      = "${var.linux_basics_config["delay"]}"
# renotify_interval   = 60
# notify_audit        = false
# timeout_h           = 0
# include_tags        = true
# locked              = false
# require_full_window = true
# no_data_timeframe   = 20
# }


# resource "datadog_monitor" "datadog_host_unreachable" {
#   name    = "Host unreachable"
#   message = "{{#is_alert}}\n${var.hno_escalation_group} \n{{/is_alert}} \n{{#is_recovery}}\n${var.hno_escalation_group} \n{{/is_recovery}}"


#   query = "datadog.agent.up.over(dd_monitoring:enabled,dd_linux_basics:enabled,env:${var.env},!dd_custom_cpu:enabled).last(1).count_by_status()"
#   type  = "service check"
#   count = "${var.dd_linux_basics == "enabled" ? 1 : 0}"


# notify_no_data      = "${var.linux_basics_config["notify_no_data"]}"
# evaluation_delay    = "${var.linux_basics_config["delay"]}"
# new_host_delay      = "${var.linux_basics_config["delay"]}"
# renotify_interval   = 60
# notify_audit        = false
# timeout_h           = 0
# include_tags        = true
# locked              = false
# require_full_window = true
# no_data_timeframe   = 20
# }