AWS CloudFront Monitoring Update: AWS released an early & small Christmas Gift to their CloudFront Customers. CloudFront now supports eight more metrics to monitor content distribution. These include:
Cache Hit Rate via HTTP POST and PUT requests, via the percentage of all cacheable requests for which CloudFront served the content from its cache, including errors not considered cacheable requests.
Origin Latency as a quota and the total time spent for requests that are served from the origin, not the CloudFront cache. Origin Latency allows to monitor the performance of your origin server.
Error Rate by status code as a percentage of requests for which the response’s HTTP status code is in the 4/5xx range, in particular 401, 403, 404, 502, 503, and 504.
AWS CloudFront Monitoring Update via AWS Blog.