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geek-cookbook
The "Geek's Cookbook" is a collection of guides for establishing your own highly-available "private cloud" and using it to run self-hosted services such as GitLab, Plex, NextCloud, etc.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I wrote training that I gave in live labs at work; you could give it a shot and see what you think. There are probably some typos in it still, like the one I just found mentioning k3d when the lab is centered around Minikube.
There is a great intro to gitops at https://geek-cookbook.funkypenguin.co.nz/
NOTE:
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Hence, a higher number means a more popular project.