S3stat
S3stat is a service that takes the detailed server access logs provided by Amazon’s CloudFront and Simple Storage Service (S3), and translates them into human readable statistics, reports and graphs.
3 Alternatives To S3stat
Icinga
Icinga is a fork of Nagios and is backward compatible.
OverOps
Know why Java code fails in production. Get the full Java source code and variable state for every error. Reproduce and Fix critical issues in seconds.
Trafikito
Monitor CPU, RAM… or output of any command and make API call on event, default is email messages.