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rethinkdb/deprecated.md

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-This image is deprecated due to maintainer inactivity (last updated Oct 2017; [docker-library/official-images#3530](https://github.com/docker-library/official-images/pull/3530)).
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-If a representative of the RethinkDB community would like to step up and continue maintenance, [the contribution guidelines](https://github.com/docker-library/official-images/blob/master/README.md#contributing-to-the-standard-library) are the best place to start.