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By default there is no such metrics on which you could construct an SNS Alert. However you can use the metrics maths to construct a maths function in following manner :
(HTTPCode_ELB_5XX_Count)/RequestCount * 100
Please refer to the following documents for more clarity on Maths expression and their usage [1,2].
Reference: [1] Using Metric Math - https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/using-metric-math.html [2] Using Metric Math - Adding a Math Expression to a CloudWatch Graph - https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/using-metric-math.html#adding-metrics-expression-console
A visual example of how to create a metric math expression can be found at: https://aws.amazon.com/blogs/mt/amazon-cloudwatch-metric-math-simplifies-near-real-time-monitoring-of-your-amazon-efs-file-systems-and-more/
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