The following operating systems and architectures are supported in Fluent Bit.
Debian 8 (Jessie)
Debian 9 (Stretch)
Raspbian 8 (Debian Jessie)
Raspbian 9 (Debian Stretch)
Ubuntu 16.04 (Xenial Xerus)
Ubuntu 18.04 (Bionic Beaver)
From an architecture support perspective, Fluent Bit is fully functional on x86, x86_64, AArch32 and AArch64 based processors.
Fluent Bit can work also on OSX and *BSD systems, but not all plugins will be available on all platforms. Official support will be expanding based on community demand.