# CloudFront
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## Alarm: 5xx error rate
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+ The alarm changes state if there are any 500 type status codes. Reported as a percentage of total requests within a 1-minute period.
+ This indicates a server failure. Check the CloudWatch logs to get further detail on the cause of the error.
+ The alarm returns to the `OK` state if the error rate is within the acceptable threshold for 5 minutes.
+ Metric: `5xxErrorRate` > 0%

## Alarm: 4xx error rate
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+ The alarm changes state if greater than or equal to 1% of requests are 400 type status codes. Reported a percentage of total requests within a 1-minute period.
+ This indicates a bad request or a possible configuration error. Check the CloudWatch logs to get further detail on the cause of the error.
+ The alarm returns to the `OK` state if the error rate is within the acceptable threshold for 5 minutes.
+ Metric: `4xxErrorRate` > 1%

## Alarm: Requests
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+ The alarm changes state if there is an anomaly in traffic with a high number of requests within 1 minute.
+ This indicates a spike or burst in traffic.
+ The alarm returns to the `OK` state if the data is within the acceptable threshold for 5 minutes.
+ The alarm is an anomaly alarm and will form the threshold based on the previous history of the metric.
+ Metric: `Requests` anomaly