This document provides information about three different events and opportunities. It announces a meetup about the Mackerel monitoring service to be held on February 21st in Tokyo. It also shares a link to an open-source home server project on GitHub called a-know-home-server. Finally, it includes a link to a job posting for a sales engineer position at Hatena.

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8. http://mackerelio.connpass.com/event/39075/

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21. https://github.com/a-know/a-know-home-server
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30. http://hatenacorp.jp/recruit/career/sales-engineer