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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.
Originally I took a udemy course which explained all the building blocks, like Network, caching, indexing, db etc. Once you know those you can start reading how these combine to make a system (https://github.com/sharanyaa/grok_sdi_educative gives all standard examples). I would also recommend to read blogs on large companies like Netflix, Linkedin etc to get an idea of real world examples alse.
NOTE:
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Hence, a higher number means a more popular project.