resource "aws_cloudwatch_metric_alarm" "redis-EngineCPUUtilization" {
  alarm_name                = "${var.cw-alarm-prefix}:Redis:EngineCPUUtilization:${var.redis-cluster-id}"
  comparison_operator       = "GreaterThanThreshold"
  evaluation_periods        = "1"
  metric_name               = "EngineCPUUtilization"
  period                    = "3600"
  statistic                 = "Average"
  threshold                 = var.threshold-EngineCPUUtilization
  alarm_description         = "Redis:EngineCPUUtilization"
  namespace                 = "AWS/ElastiCache"
  insufficient_data_actions = []
  actions_enabled           = var.actions-enabled
  alarm_actions             = [var.sns-targets.alarm-actions-urgent]
  ok_actions                = [var.sns-targets.alarm-actions-urgent]
  dimensions = {
    CacheClusterId = var.redis-cluster-id
  }
  tags = var.default-tags
  lifecycle {
    ignore_changes = [tags]
  }
}

resource "aws_cloudwatch_metric_alarm" "redis-DatabaseMemoryUsagePercentage" {
  alarm_name                = "${var.cw-alarm-prefix}:Redis:DatabaseMemoryUsagePercentage:${var.redis-cluster-id}"
  comparison_operator       = "GreaterThanThreshold"
  evaluation_periods        = "1"
  metric_name               = "DatabaseMemoryUsagePercentage"
  period                    = "3600"
  statistic                 = "Average"
  threshold                 = var.threshold-DatabaseMemoryUsagePercentage
  alarm_description         = "Redis:DatabaseMemoryUsagePercentage"
  namespace                 = "AWS/ElastiCache"
  insufficient_data_actions = []
  actions_enabled           = var.actions-enabled
  alarm_actions             = [var.sns-targets.alarm-actions-urgent]
  ok_actions                = [var.sns-targets.alarm-actions-urgent]
  dimensions = {
    CacheClusterId = var.redis-cluster-id
  }
  tags = var.default-tags
  lifecycle {
    ignore_changes = [tags]
  }
}

resource "aws_cloudwatch_metric_alarm" "redis-CacheHitRate" {
  alarm_name                = "${var.cw-alarm-prefix}:Redis:CacheHitRate:${var.redis-cluster-id}"
  comparison_operator       = "LessThanThreshold"
  evaluation_periods        = "4"
  metric_name               = "CacheHitRate"
  period                    = "900"
  statistic                 = "Average"
  threshold                 = var.threshold-CacheHitRate
  alarm_description         = "Redis:CacheHitRate"
  namespace                 = "AWS/ElastiCache"
  insufficient_data_actions = []
  actions_enabled           = var.actions-enabled
  alarm_actions             = [var.sns-targets.alarm-actions-standard]
  ok_actions                = [var.sns-targets.alarm-actions-standard]
  dimensions = {
    CacheClusterId = var.redis-cluster-id
    # CacheNodeId = each.value
  }
  tags = var.default-tags
  lifecycle {
    ignore_changes = [tags]
  }
}