AWS announced the availability of X-Ray in beta as one of the many product announcements that were made at the re:Invent conference.
Like most (all?) tracing solutions AWS X-Ray follows the architecture initially described in the Google Dapper paper. It even comes with a daemon that collects the metrics locally before shipping them as described in the paper (and as opposed to something like Zipkin).
The AWS X-Ray console allows running some pretty sophisticated queries against all the traces which is probably one of the most interesting aspect.
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