redis_cloudwatch.tf

resource "aws_cloudwatch_metric_alarm" "redis_eviction_alarm" {
  alarm_name          = "production-redis-high-eviction-rate"
  comparison_operator = "GreaterThanThreshold"
  evaluation_periods  = "1"
  period              = "60"
  metric_name         = "Evictions"

  dimensions {
    CacheClusterId = "< Redis CluserId >"
  }

  namespace = "AWS/ElastiCache"
  statistic = "Sum"
  threshold = "0"

  actions_enabled    = "true"
  alarm_actions      = [ <alarm action> ]
  alarm_description  = "Monitors when production redis eviction rate > 0"
  treat_missing_data = "missing"
}