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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.
Just start from the wiki Configuration page and make yourself comfortable with polybar's configuration, it's really easy and pretty much self-explanatory. Then read the wiki's page for the modules you are interested in and just experiment! The page about formatting is important too.
Not a stupid question. Just in case you're looking for some themes, I have a small collection https://github.com/Murzchnvok/polybar-collection
NOTE:
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Hence, a higher number means a more popular project.