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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.
There is a great repo here https://github.com/pulkitgupta2k/devnet-associate which is split per domain with resources and links. There is the devnet fundamental course, which you could jump into for the domains to cover the gaps.
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.