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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.
Haven't used it, but what about this gem - https://github.com/gevans/sidekiq-throttler
rack-throttle is usually used to throttle incoming requests, but it has a generic [Second](Rack::Throttle::Second) class which could be used to throttle any operation to a maximum number per second. It stores its counter in either redis or memcache, which will work as the shared store and be performant.
Here’s a possible solution that is similar to (although more complex than) what I ended up going with: https://github.com/nulib/redrate
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