Document the storage.backlog.flush_on_shutdown Fluent Bit buffer option - #344
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Add a Buffering subsection covering the new opt-in BufferStorage option that flushes filesystem-backlog chunks on graceful shutdown, avoiding buffered-record loss on node drain or spot reclaim (logging-operator #2282).
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July 31, 2026 18:45
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Fluent Bit can now flush filesystem-backlog chunks to their destination during a graceful shutdown through the new opt-in
storage.backlog.flush_on_shutdownfield on theBufferStoragespec. Without it, buffered records are lost when a node is drained or a spot instance is reclaimed.This adds a "Flush the filesystem buffer on shutdown" subsection to the Buffering section of the Fluent Bit log collector page (
content/docs/logging-infrastructure/fluentbit.md). It explains the option, itsOn/Offvalues andOffdefault, the filesystem-buffering prerequisite, and aFluentbitAgentexample, and cross-referencesterminationGracePeriodSecondsso the pod has time to finish flushing. The generated CRD reference page picks up the field automatically on the next upstream sync, so it is intentionally left untouched here.Trigger Events