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> Where does it say this? I don't think this was ever the case for Fluentd.

It's in http://docs.fluentd.org/articles/high-availability#forwarder..., which says:

However, possible message loss scenarios do exist:

The process [log forwarder’s fluentd from the paragraph above] dies immediately after receiving the events, but before writing them into the buffer.

Is this document out of date?

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>Is this document out of date?

No, in the described case, the message can get lost. This is a really unlikely scenario though. The only real-world case that I know of first-hand is using file buffer and somehow being unable to write to disk, possibly because the disk is full. Something like that can be prevented by a fairly routine set of server monitoring alerts.

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