terraform.aws-baseline-infra/modules/ManagementGovernance/Monitoring.Redis/main.tf

resource aws_cloudwatch_metric_alarm redis-EngineCPUUtilization {
  alarm_name = "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 = "true"
  alarm_actions = [var.alarm-actions-urgent]
  ok_actions = [var.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 = "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 = "true"
  alarm_actions = [var.alarm-actions-urgent]
  ok_actions = [var.alarm-actions-urgent]
  dimensions = {
    CacheClusterId = var.redis-cluster-id
  }
  tags = var.default-tags
  lifecycle {
    ignore_changes = [tags]
  }
}

/*
data aws_elasticache_cluster redis-cluster {
  cluster_id = var.redis-cluster-id
}
*/
resource aws_cloudwatch_metric_alarm redis-CacheHitRate {
  # for_each = toset(data.aws_elasticache_cluster.redis-cluster.cache_nodes.*.id)
  alarm_name = "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 = "true"
  alarm_actions = [var.alarm-actions-standard]
  ok_actions = [var.alarm-actions-standard]
  dimensions = {
    CacheClusterId = var.redis-cluster-id
    # CacheNodeId = each.value
  }
  tags = var.default-tags
  lifecycle {
    ignore_changes = [tags]
  }
}