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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.
Use async, have a single shared background thread that uses epoll to find the next write that succeeds (this is performant enough for almost all purposes, it is what the async-io library does if you don't use the block_on function that let's it get fancy with wakers).
isahc uses threads internally: https://github.com/sagebind/isahc/blob/master/src/agent.rs
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