allegro / ralph_pricing / 2003

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travis-ci

Notifications about anomalies in usages (#544)

Detect missing values and unusually big changes in uploaded usage types and notify their owners.

This PR adds management command which should be launched on daily basis (e.g. from cron). It analyzes usage types uploaded during the month-wide window, which ends on the date give via -e argument.

It looks for two types of anomalies: missing usage types for given day, and unusually big changes of values between two consecutive days, where by "unusually big" it understands a relative change calculated with (d1 - d2) / d2, compared to the value stored in UsageType.change_tolerance (0.2 by default). In case of detecting any of such anomalies, all the owners of a given usage type will be notified by e-mail.

It also implements a "tolerance margin" for missing values, accounting for the cases where usage types are not expected due to longer upload frequency (e.g. monthly instead of daily), and/or where the owners shouldn't receive e-mails because they won't be able to react anyway (e.g. during the weekends).

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