-
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.
For example: this one is closed with an explanation of, essentially: "This is big and complicated, but we're working on it." In other words, they agree that it's an issue, and agree that it should be fixed, but closed the issue anyway (as "completed") because it's "too big".
Their standard libraries are open though
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.