[Bug]: AWS CloudWatch alarm not associating with metric for S3 bucket policy changes

[sebasti-reeta-mary]

Terraform Core Version

1.6.6

AWS Provider Version

5.32.1, 4.67.0

Affected Resource(s)

aws_cloudwatch_metric_alarm

Expected Behavior

The metric alarm should be associated with the metric for CIS-S3BucketPolicyChanges.

Actual Behavior

The deployment was all successful. However the alarm was not associated with the metric. I have implemented same code for other resource action monitoring/alerting everything works except for this one and no errors too.

Attaching screenshot of non-association of alarm with metric:

Relevant Error/Panic Output Snippet

No errors.

Terraform Configuration Files

resource "aws_cloudwatch_log_metric_filter" "s3_bucket_policy_changes" {
  count          = var.alerting_enabled ? 1 : 0
  name           = "CIS-S3BucketPolicyChanges"
  pattern        = "{ ($.eventSource = s3.amazonaws.com) && (($.eventName = PutBucketAcl) || ($.eventName = PutBucketPolicy) || ($.eventName = PutBucketCors) || ($.eventName = PutBucketLifecycle) || ($.eventName = PutBucketReplication) || ($.eventName = DeleteBucketPolicy) || ($.eventName = DeleteBucketCors) || ($.eventName = DeleteBucketLifecycle) || ($.eventName = DeleteBucketReplication)) }"
  log_group_name = var.log_group_name
  metric_transformation {
    name      = "S3BucketPolicyChanges"
    namespace = "CISAWSBenchmarks"
    value     = "1"
  }
}

resource "aws_cloudwatch_metric_alarm" "s3_bucket_policy_changes" {
  count                     = var.alerting_enabled ? 1 : 0
  alarm_name                = "CIS-S3BucketPolicyChanges"
  comparison_operator       = "GreaterThanOrEqualToThreshold"
  evaluation_periods        = "1"
  metric_name               = aws_cloudwatch_log_metric_filter.s3_bucket_policy_changes[0].id
  namespace                 = "CISAWSBenchmarks"
  period                    = "120"
  statistic                 = "Sum"
  threshold                 = "1"
  alarm_description         = "Monitoring changes to S3 bucket policies may reduce time to detect and correct permissive policies on sensitive S3 buckets."
  alarm_actions             = [aws_sns_topic.cis_alerts_sns_topic.arn]
  treat_missing_data        = "notBreaching"
  insufficient_data_actions = []
  tags                      = merge({ "Name" = "S3BucketsPolicyChangesAlarm" }, var.custom_tags)
}

Steps to Reproduce

Please provide the inputs for log_group_name (any existing log group name) and alarm_actions can be set to [].

terraform init
terraform plan
terraform apply

Debug Output

No response

Panic Output

No response

Important Factoids

No response

References

No response

Would you like to implement a fix?

None

[github-actions]

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[sebasti-reeta-mary]

Attaching code as a file. Remove .txt at end to reproduce.
main.tf.txt