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Document ChangeProp and EventBus monitoring
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Description

ChangeProp and Event-Platform have a very sophisticated dashboard with various graphs. We should document how to use the dashboard, what exactly each graph means, how do normal behavior look like and how the known abnormalities look like.

Also there's a bunch of custom tools and scripts that were developed operating the system to look deep into Kafka topics and inspect what's actually happening - those should also be documented and potentially puppetised.

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Began making the documentation page for the whole system on WikiTech. It's still an fairly early WIP but ideas on what to put over there are welcome. Currently it covers general architecture of the system, monitoring and some design considerations.