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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.
The main gotcha is these things won't help you if your code dies before it starts networking. If you want to debug that stuff, you pretty much need something like this thing.
NOTE:
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Hence, a higher number means a more popular project.