Whisper

Whisper is a format which stores timeseries data for graphite (software for storing timeseries, normally for system monitoring).

There is one whisper file for each metric recorded. The file is a fixed-size file, in a similar way to RRD files.

While there is no magic for the file, the first four bytes is "aggregation type": a value between and.

Links

 * http://graphite.readthedocs.io/en/latest/whisper.html