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linuxupskillchallenge
Discontinued Learn the skills required to sysadmin a remote Linux server from the commandline.
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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.
See https://github.com/MickUWL/Reddit-question for the text files of tasks
(I've also found what I had mentioned in a different comment, see r/linuxupskillchallenge and their github repo https://github.com/snori74/linuxupskillchallenge - this covers most of the things in my tasks 1&2 text files on github, with resources listed etc)
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.