Kairos

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New API to fully support customized data reading.

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Provide callers with the ability to customize the fetching of data from a timeseries.

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pin monthdelta requirement, pull request 22 from titusz
https://github.com/agoragames/kairos/pull/22

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Fixed insert on count timeseries not supporting the intervals keyword argument.

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Adding support for inserting data into multiple intervals with a single
call to `insert()`.

Added support for set types when using redis storage.

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Added `collapse` keyword argument to `series()` for collapsing an entire
timeseries into a single row. Transforms are performed after the collapse,
allowing easy calculation of aggregates across an entire timeseries.

Fix inconsistency in gauge type when collapsing or condensing gauge data.
Value for an interval is the last recorded non-null gauge value now.

Added support in `get()` and `series()` for joining multiple timeseries
into a single result by calling with a list of timeseries names rather
than a single string.