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cortex
A horizontally scalable, highly available, multi-tenant, long term Prometheus. (by cortexproject)
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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.
Not a lot to go on in your post, but you might find some inspiration from this project (written in golang) which handles huge data sets (metrics). https://cortexmetrics.io/
NOTE:
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Hence, a higher number means a more popular project.