Fluent Bit v5.0.9

Issues

• out_cloudwatch_logs: Plug SEGV on not found error

  docs-required
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  fluent/fluent-bit#11983·by cosmo0920 was merged Jul 3, 2026
  5

• filter_kubernetes: Attach k8s metadata for internal logs

  docs-required
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  fluent/fluent-bit#11998·by cosmo0920 was merged Jul 2, 2026
  3

• in_ebpf: Implement openssl trace

  docs-required
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  fluent/fluent-bit#11793·by cosmo0920 was merged Jul 2, 2026
  8

• tests: runtime: Try to address test hang

  docs-required
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  fluent/fluent-bit#12000·by cosmo0920 was merged Jul 1, 2026
  1

• in_windows_exporter_metrics: Implement user-defined performance counters w/ PDH

  docs-required
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  fluent/fluent-bit#12006·by cosmo0920 was merged Jul 1, 2026
  8

• tests: runtime: Use more concrete matchers for assertions

  docs-required
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  fluent/fluent-bit#12014·by cosmo0920 was merged Jul 2, 2026
  4

• in_tail: Another attempt to plug segv on in tail

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  fluent/fluent-bit#12010·by cosmo0920 was merged Jul 2, 2026
  5

• release: update to 5.0.9

  docs-required
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  fluent/fluent-bit#12018·by cosmo0920 was merged Jun 30, 2026
  3

• lib: librdkafka: Upgrade to v2.15.0

  backport to v4.2.xok-package-test
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  fluent/fluent-bit#12028·by cosmo0920 was merged Jul 3, 2026
  7

• filter_write_tag: in_emitter: Mitigate data loss on multiline

  backport to v4.2.xdocs-required
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  fluent/fluent-bit#12029·by cosmo0920 was merged Jul 2, 2026
  6

• in_forward: validate PING is a msgpack array in check_ping

  backport to v4.2.xdocs-required
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  fluent/fluent-bit#12034·by saddamr3e was merged Jul 6, 2026
  2

• out_forward: align secure forward handshake and chunk ack with protocol spec

  backport to v4.2.xdocs-required
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  fluent/fluent-bit#12037·by edsiper was merged Jul 6, 2026
  3

• in_ebpf: Generate mostly monotonic event id for increasing traceability

  docs-required
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  fluent/fluent-bit#12002·by cosmo0920 was merged Jul 3, 2026
  3

• in_splunk: return Splunk HEC auth status codes

  backport to v4.2.x
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  fluent/fluent-bit#12043·by lecaros was merged Jul 8, 2026
  3

• in_forward: fix 100% CPU hang and connection teardown use-after-free

  backport to v4.2.xdocs-required
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  fluent/fluent-bit#12044·by edsiper was merged Jul 6, 2026
  5

• Forward input: connection cleanup fails, hangs CPU at 100%

  status: waiting-for-triage
  fluent/fluent-bit#12025 · by Filter by author spstack was closed on Jul 4, 2026 · Fluent Bit v5.0.9
  4

• out_stackdriver: fix multi-worker resource-metadata data race (SIGSEGV)

  docs-required
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  fluent/fluent-bit#12023·by erain was merged Jul 4, 2026
  8

• out_stackdriver: fix payload parsing over-reads and null safety

  docs-required
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  fluent/fluent-bit#12022·by erain was merged Jul 4, 2026
  8

• gzip: skip FCOMMENT terminator in streaming decompressor

  docs-required
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  fluent/fluent-bit#11969·by saddamr3e was merged Jul 4, 2026
  5