Sprockets.mixins.metrics

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- Rework InfluxDB buffering to use a periodic callback instead of flushing
the buffer upon request.

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- Fix packaging woes part deux.

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- Update InfluxDB mixin to buffer measurements across requests based on a
max time and/or length.

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- Fix packaging woes.

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- Remove extraneous quotes from InfluxDB tag values.
- Convert HTTP status code from value to a tag in the InfluxDB mix-in.

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- Add :class:`sprockets.mixins.metrics.StatsdMixin`
- Add :class:`sprockets.mixins.metrics.testing.FakeStatsdServer`
- Add :class:`sprockets.mixins.metrics.testing.FakeInfluxHandler`
- Add :class:`sprockets.mixins.metrics.InfluxDBMixin`
- Add :class:`sprockets.mixins.metrics.influxdb.InfluxDBConnection`

.. _Next Release: https://github.com/sprockets/sprockets.mixins.metrics/compare/4.1.0...master
.. _4.1.0: https://github.com/sprockets/sprockets.mixins.metrics/compare/4.0.0...4.1.0
.. _4.0.0: https://github.com/sprockets/sprockets.mixins.metrics/compare/3.1.1...4.0.0
.. _3.1.1: https://github.com/sprockets/sprockets.mixins.metrics/compare/3.1.0...3.1.1
.. _3.1.0: https://github.com/sprockets/sprockets.mixins.metrics/compare/3.0.4...3.1.0
.. _3.0.4: https://github.com/sprockets/sprockets.mixins.metrics/compare/3.0.3...3.0.4
.. _3.0.3: https://github.com/sprockets/sprockets.mixins.metrics/compare/3.0.2...3.0.3
.. _3.0.2: https://github.com/sprockets/sprockets.mixins.metrics/compare/3.0.1...3.0.2
.. _3.0.1: https://github.com/sprockets/sprockets.mixins.metrics/compare/3.0.0...3.0.1
.. _3.0.0: https://github.com/sprockets/sprockets.mixins.metrics/compare/2.1.1...3.0.0
.. _2.1.1: https://github.com/sprockets/sprockets.mixins.metrics/compare/2.1.0...2.1.1
.. _2.1.0: https://github.com/sprockets/sprockets.mixins.metrics/compare/2.0.1...2.1.0
.. _2.0.1: https://github.com/sprockets/sprockets.mixins.metrics/compare/2.0.0...2.0.1
.. _2.0.0: https://github.com/sprockets/sprockets.mixins.metrics/compare/1.1.1...2.0.0
.. _1.1.1: https://github.com/sprockets/sprockets.mixins.metrics/compare/1.1.0...1.1.1
.. _1.1.0: https://github.com/sprockets/sprockets.mixins.metrics/compare/1.0.1...1.1.0
.. _1.0.1: https://github.com/sprockets/sprockets.mixins.metrics/compare/1.0.0...1.0.1
.. _1.0.0: https://github.com/sprockets/sprockets.mixins.metrics/compare/0.9.0...1.0.0
.. _0.9.0: https://github.com/sprockets/sprockets.mixins.metrics/compare/0.0.0...0.9.0