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.
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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.
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Trafikito

Monitor CPU, RAM… or output of any command and make API call on event, default is email messages.