AWS Log metric filter and alarm does not exist for S3 bucket policy changes
This policy identifies the AWS regions which do not have a log metric filter and alarm for S3 bucket policy changes. Monitoring changes to S3 bucket policies may reduce time to detect and correct permissive policies on sensitive S3 buckets. It is recommended that a metric filter and alarm be established for changes to S3 bucket policies.

NOTE: This policy will trigger alert if you have at least one Cloudtrail with the multi trial is enabled, Logs all management events in your account and is not set with specific log metric filter and alarm.
This is applicable to aws cloud and is considered a informational severity issue.
Sample categories of findings relevant here are ['MISCONFIGURATION'].
Mitigation of this issue can be done as follows: 1. Sign in to AWS Console
2. Navigate to CloudWatch dashboard
3. Click on 'Log groups' in the 'Logs' section (Left panel)
4. Select the log group created for your CloudTrail trail event logs (CloudTrail should be multi trail enabled with all management events captured) and click 'Create Metric Filter' button.
5. In 'Define Logs Metric Filter' page, add 'Filter pattern' value as 
{ ($.eventSource = s3.amazonaws.com) && (($.eventName = PutBucketAcl) || ($.eventName = PutBucketPolicy) || ($.eventName = PutBucketCors) || ($.eventName = PutBucketLifecycle) || ($.eventName = PutBucketReplication) || ($.eventName = DeleteBucketPolicy) || ($.eventName = DeleteBucketCors) || ($.eventName = DeleteBucketLifecycle) || ($.eventName = DeleteBucketReplication)) }
and Click on 'Assign Metric'
6. In 'Create Metric Filter and Assign a Metric' page, Choose Filter Name, Metric Details parameter according to your requirement and click on 'Create Filter'
7. Click on 'Create Alarm',
	- In Step 1 specify metric details and conditions details as required and click on 'Next'
	- In Step 2 Select an SNS topic either by creating a new topic or use existing SNS topic/ARN and click on 'Next'
	- In Step 3 Select name and description to alarm and click on 'Next'
	- In Step 4 Preview your data entered and click on 'Create Alarm'.

Query:
```config from cloud.resource where api.name = 'aws-logs-describe-metric-filters' as X; config from cloud.resource where api.name = 'aws-cloudwatch-describe-alarms' as Y; config from cloud.resource where api.name = 'aws-cloudtrail-describe-trails' as Z; filter '(($.Z.cloudWatchLogsLogGroupArn is not empty and $.Z.cloudWatchLogsLogGroupArn contains $.X.logGroupName and $.Z.isMultiRegionTrail is true and $.Z.includeGlobalServiceEvents is true) and (($.X.filterPattern contains "eventName=" or $.X.filterPattern contains "eventName =") and ($.X.filterPattern does not contain "eventName!=" and $.X.filterPattern does not contain "eventName !=") and ($.X.filterPattern contains "eventSource=" or $.X.filterPattern contains "eventSource =") and ($.X.filterPattern does not contain "eventSource!=" and $.X.filterPattern does not contain "eventSource !=") and $.X.filterPattern contains s3.amazonaws.com and $.X.filterPattern contains PutBucketAcl and $.X.filterPattern contains PutBucketPolicy and $.X.filterPattern contains PutBucketCors and $.X.filterPattern contains PutBucketLifecycle and $.X.filterPattern contains PutBucketReplication and $.X.filterPattern contains DeleteBucketPolicy and $.X.filterPattern contains DeleteBucketCors and $.X.filterPattern contains DeleteBucketLifecycle and $.X.filterPattern contains DeleteBucketReplication) and ($.X.metricTransformations[*] contains $.Y.metricName))'; show X; count(X) less than 1```