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Moby
The Moby Project - a collaborative project for the container ecosystem to assemble container-based systems
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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.
fwiw, they've been touching on btrfs IO frequently over the past few weeks. https://github.com/torvalds/linux/commits/master/fs/btrfs, especially with a lot on async handling.
I went from using btrfs filesystem as root back to ext4 because it led to poor Docker performance and leftover docker volumes that I had to clean up manually a couple times.. https://github.com/moby/moby/issues/27653
ZFS has bugs too, but people don't bitch about them here.