Full logger implementation uses noexcept for methods that can throw exceptions

[AdamStepan]

Methods look like this:

virtual void log*(std::uint_fast64_t poolId) const noexcept override
{
    SpinGuard guard{lock};
    std::cerr << stringify("Pool [", poolId, "]: *") << std::flush;
}

But operator<< is not noexcept.

[MrWarlockX]

I suggest using printf functions instead of iostreams, since printf function family are noexcept by default.

[majcl]

iostreams doesnt throw exceptions by default

[AdamStepan]

Yes, but you don't have a guarantee that someone didn't enable them via exceptions method. So, these methods are not noexcept (https://en.cppreference.com/w/cpp/io/basic_ostream/operator_ltlt)