Cloudwatch alarm for IAM Policies changes doesn't work

I'm just trying to create fully functional alarm that will change state if there's any IAM Policies changes will be made.

1. Create an S3 Bucket for Cloudtrail logs.
2. Create trail in Cloudtrail.
3. Add Metric filter:

{($.eventName=DeleteGroupPolicy)||($.eventName=DeleteRolePolicy)||($.eventName=DeleteUserPolicy)||($.eventName=PutGroupPolicy)||($.eventName=PutRolePolicy)||($.eventName=PutUserPolicy)||($.eventName=CreatePolicy)||($.eventName=DeletePolicy)||($.eventName=CreatePolicyVersion)||($.eventName=DeletePolicyVersion)||($.eventName=AttachRolePolicy)||($.eventName=DetachRolePolicy)||($.eventName=AttachUserPolicy)||($.eventName=DetachUserPolicy)||($.eventName=AttachGroupPolicy)||($.eventName=DetachGroupPolicy)}

4. Create Alarm for this filter by using created Metric and Metricname.

If I attach or detach any policy for any IAM Role - nothing happening.

There's a policies for cloudwatch role:

    "Statement": [
        {
            "Action": [
                "s3:GetBucketAcl",
                "s3:PutObject",
                "cloudtrail:StartLogging",
                "cloudtrail:StopLogging",
                "cloudtrail:Get*",
                "cloudtrail:CreateTrail",
                "cloudtrail:UpdateTrail",
                "iam:CreateServiceLinkedRole",
                "iam:CreateRole",
                "iam:PutRolePolicy",
                "iam:AttachRolePolicy",
                "iam:ListRoles",
                "iam:GetRolePolicy",
                "iam:GetUser",
                "iam:GetPolicy",
                "iam:GetPolicyVersion",
                "iam:GetRole"
                "autoscaling:Describe*",
                "cloudwatch:*",
                "logs:*",
                "sns:*"
            ],
            "Effect": "Allow",
            "Resource": "*"
        }
    ],
    "Version": "2012-10-17"
}

Anyone can advise why there's no changes in alarm state?

Well, I figured it out: It works correctly only in the us-east-1 region. I saw a hint in some instructions, which said something completely different, and decided to try setting up IAM Changes Alarm in another region.

@shimo, thanks for reassuring me that my settings are completely correct.