AWS AmazonCloudWatch documentation change
Summary
Expanded documentation of Metrics Insights alarm limits including query processing constraints, result capping, and operational guidance
Security assessment
The changes clarify service quotas and query processing limitations without mentioning security vulnerabilities, access controls, or encryption. The focus is on operational limits like 10,000 metrics processing cap and 500 result rows limit, which relate to scalability rather than security.
Diff
diff --git a/AmazonCloudWatch/latest/monitoring/Create_Metrics_Insights_Alarm.md b/AmazonCloudWatch/latest/monitoring/Create_Metrics_Insights_Alarm.md index 3442d757e..f611fa489 100644 --- a//AmazonCloudWatch/latest/monitoring/Create_Metrics_Insights_Alarm.md +++ b//AmazonCloudWatch/latest/monitoring/Create_Metrics_Insights_Alarm.md @@ -48 +48 @@ These clauses are essential for proper alarm evaluation. The `GROUP BY` clause s -When working with CloudWatch Metrics Insights alarms, be aware of these functional limits: +CloudWatch Metrics Insights alarms use queries to evaluate multiple metrics and time series simultaneously. These alarms have specific limits that affect how your queries are processed and what data is available for alarm evaluation. @@ -50 +50 @@ When working with CloudWatch Metrics Insights alarms, be aware of these function - * 200 alarms using this syntax per account per Region +CloudWatch Metrics Insights alarms have the following limits: @@ -52 +52 @@ When working with CloudWatch Metrics Insights alarms, be aware of these function - * Only the latest 3 hours of data can be used for evaluating the alarm's conditions. However, you can visualize up to two weeks of data on the alarm's detail page graph + * **Account limit** : 200 alarms per account per Region @@ -54 +54 @@ When working with CloudWatch Metrics Insights alarms, be aware of these function - * Alarms evaluating multiple time series will limit the rate of concurrent transitions to 100 + * **Data evaluation window** : Only the most recent 3 hours of data is used for alarm evaluation @@ -56 +56 @@ When working with CloudWatch Metrics Insights alarms, be aware of these function - * Metrics Insights limits on the maximum number of time series analyzed or returned apply + * Note: The alarm detail page can display up to 2 weeks of historical data for visualization @@ -57,0 +58 @@ When working with CloudWatch Metrics Insights alarms, be aware of these function + * **Transition rate limiting** : Alarms monitoring multiple time series are limited to 100 concurrent state transitions @@ -58,0 +60 @@ When working with CloudWatch Metrics Insights alarms, be aware of these function + * **Query processing limits** : These limits apply at different stages of query execution: @@ -59,0 +62 @@ When working with CloudWatch Metrics Insights alarms, be aware of these function + * **Input processing** : A Metrics Insights query can process no more than 10,000 metrics. If your query matches more than 10,000 metrics (for example, across thousands of EC2 instances), the query will only process the first 10,000 metrics that it finds @@ -61 +64,8 @@ When working with CloudWatch Metrics Insights alarms, be aware of these function -For more information on CloudWatch service quotas and limits, see [CloudWatch service quotas](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch_limits.html). + * **Output results** : If your processed query would normally return more than 500 result rows, CloudWatch caps the results at 500. Since alarms require an ORDER BY clause, you'll receive the 500 highest or lowest results based on your sorting configuration + + + + +Understanding these limits helps you design effective queries. For instance, if you're monitoring a large fleet, consider using more specific filters to stay within the 10,000 metric processing limit, or use aggregation functions to reduce the number of result rows returned. + +For more information on Metrics Insights queries quotas and limits, see [Metrics Insights quotas](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch-metrics-insights-limits.html).