data "aws_caller_identity" "this" {}

resource "aws_cloudwatch_metric_alarm" "ES-CPUUtilization" {
  alarm_name                = "${var.cw-alarm-prefix}:ES:CPUUtilization:${var.domain-name}"
  comparison_operator       = "GreaterThanThreshold"
  evaluation_periods        = "3"
  metric_name               = "CPUUtilization"
  period                    = "1800"
  statistic                 = "Average"
  threshold                 = var.threshold-CPUUtilization
  alarm_description         = "ES:CPUUtilization"
  namespace                 = "AWS/ES"
  insufficient_data_actions = []
  actions_enabled           = var.actions-enabled
  alarm_actions             = [var.alarm-actions-urgent]
  ok_actions                = [var.alarm-actions-urgent]
  dimensions = {
    DomainName = var.domain-name
    ClientId   = data.aws_caller_identity.this.id
  }
  tags = var.default-tags
  lifecycle {
    ignore_changes = [tags]
  }
}

resource "aws_cloudwatch_metric_alarm" "ES-SearchLatency" {
  alarm_name                = "${var.cw-alarm-prefix}:ES:SearchLatency:${var.domain-name}"
  comparison_operator       = "GreaterThanThreshold"
  evaluation_periods        = "3"
  metric_name               = "SearchLatency"
  period                    = "1800"
  statistic                 = "Average"
  threshold                 = var.threshold-SearchLatency
  alarm_description         = "ES:SearchLatency"
  namespace                 = "AWS/ES"
  insufficient_data_actions = []
  actions_enabled           = var.actions-enabled
  alarm_actions             = [var.alarm-actions-urgent]
  ok_actions                = [var.alarm-actions-urgent]
  dimensions = {
    DomainName = var.domain-name
    ClientId   = data.aws_caller_identity.this.id
  }
  tags = var.default-tags
  lifecycle {
    ignore_changes = [tags]
  }
}

resource "aws_cloudwatch_metric_alarm" "ES-IndexingLatency" {
  alarm_name                = "${var.cw-alarm-prefix}:ES:IndexingLatency:${var.domain-name}"
  comparison_operator       = "GreaterThanThreshold"
  evaluation_periods        = "3"
  metric_name               = "IndexingLatency"
  period                    = "1800"
  statistic                 = "Average"
  threshold                 = var.threshold-IndexingLatency
  alarm_description         = "ES:IndexingLatency"
  namespace                 = "AWS/ES"
  insufficient_data_actions = []
  actions_enabled           = var.actions-enabled
  alarm_actions             = [var.alarm-actions-urgent]
  ok_actions                = [var.alarm-actions-urgent]
  dimensions = {
    DomainName = var.domain-name
    ClientId   = data.aws_caller_identity.this.id
  }
  tags = var.default-tags
  lifecycle {
    ignore_changes = [tags]
  }
}

resource "aws_cloudwatch_metric_alarm" "ES-ClusterStatusRed" {
  alarm_name                = "${var.cw-alarm-prefix}:ES:ClusterStatusRed:${var.domain-name}"
  comparison_operator       = "GreaterThanThreshold"
  evaluation_periods        = "2"
  metric_name               = "ClusterStatus.red"
  period                    = "900"
  statistic                 = "Maximum"
  threshold                 = 0
  alarm_description         = "At least one primary shard and its replicas aren't allocated to a node."
  namespace                 = "AWS/ES"
  insufficient_data_actions = []
  actions_enabled           = var.actions-enabled
  alarm_actions             = [var.alarm-actions-urgent]
  ok_actions                = [var.alarm-actions-urgent]
  dimensions = {
    DomainName = var.domain-name
    ClientId   = data.aws_caller_identity.this.id
  }
  tags = var.default-tags
  lifecycle {
    ignore_changes = [tags]
  }
}