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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.
Example 2 uses the PubSub client library.
I've managed to get example 1 working via a bad hack that contains a race condition waiting to happen (but hasn't manifested yet on my hardware).
NOTE:
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Hence, a higher number means a more popular project.