Fluent Bit v5.2.0

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Due by November 9, 2026

•Last updated Oct 16, 2026

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out_vivo_exporter: fix telemetry loss and add compressed OTLP JSON
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#12418 opened Sep 16, 2026 · Updated Sep 16, 2026
14
processor_journald_otel: handle journald as otel processed logs
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#12387 opened Sep 8, 2026 · Updated Oct 15, 2026
10
output: engine: output_throttle: Implement throttle operations for output plugins
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#12393 opened Sep 9, 2026 · Updated Sep 17, 2026
32
in_tail: Implement budget for max number of opening files
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#12441 opened Sep 18, 2026 · Updated Sep 28, 2026
7
wasm: add experimental browser runtime and SDK
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#12429 opened Sep 17, 2026 · Updated Sep 30, 2026Draft
1
output: mitigate heavy loaded case
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#12484 opened Sep 29, 2026 · Updated Sep 29, 2026
8
procesor_content_modifier: Accept list on configure
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#12329 opened Aug 25, 2026 · Updated Sep 29, 2026
9
lib: upgrade bundled jemalloc to 5.4.0
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#12493 opened Sep 30, 2026 · Updated Sep 30, 2026
5
lib: upgrade LuaJIT and fix CMake wrapper compatibility
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#12503 opened Oct 1, 2026 · Updated Oct 1, 2026
10
processor: fuse compatible content modifier chains
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#12505 opened Oct 2, 2026 · Updated Oct 2, 2026Draft
1
processor_sql: preserve resource and scope groups when filtering logs
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#12506 opened Oct 2, 2026 · Updated Oct 2, 2026Draft
1
out_opentelemetry: preserve dropped attribute counts in log exports
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#12507 opened Oct 2, 2026 · Updated Oct 2, 2026Draft
1
processor: isolate CFL codec state across worker invocations
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#12511 opened Oct 2, 2026 · Updated Oct 2, 2026Draft
1
Linear memory growth (reclaimable kernel slab) with storage.type: filesystem. POOL proposal.
fluent/fluent-bit#12504 · opened on Oct 1, 2026 · Fluent Bit v5.2.0
7
wasm: filter_wasm: pack value len pair for returned format of wasm
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#12518 opened Oct 5, 2026 · Updated Oct 9, 2026
6
out_s3: make an optional arrow schema option
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#12529 opened Oct 8, 2026 · Updated Oct 10, 2026
9
http_server: in_opentelemetry: plug decompress explosion possibilities
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#12568 opened Oct 13, 2026 · Updated Oct 13, 2026
8
in_prometheus_textfile: append multiple contexts of prometheus texts payloads
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#12576 opened Oct 14, 2026 · Updated Oct 14, 2026
8
http_server: mitigate automatic inflation bypass
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#12581 opened Oct 15, 2026 · Updated Oct 15, 2026
9
tests: fix HTTP JSON stream runtime assertions
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#12582 opened Oct 15, 2026 · Updated Oct 15, 2026
2
filter_kubernetes: mitigate SEGV occurrences on using Use_Kubelet
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#12580 opened Oct 15, 2026 · Updated Oct 15, 2026
2
in_syslog: mitigate potential overflow on payloads
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#12584 opened Oct 15, 2026 · Updated Oct 15, 2026
4
out_file: out_nats: Sanitize malicious tags
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#12587 opened Oct 16, 2026 · Updated Oct 16, 2026
13
http_server: address cumulative bytes on http2 headers
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#12590 opened Oct 16, 2026 · Updated Oct 16, 2026
6
processor_fts: add Fluent Typed Scripting processor
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#12589 opened Oct 16, 2026 · Updated Oct 17, 2026
16

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Fluent Bit v5.2.0

out_vivo_exporter: fix telemetry loss and add compressed OTLP JSON

processor_journald_otel: handle journald as otel processed logs

output: engine: output_throttle: Implement throttle operations for output plugins

in_tail: Implement budget for max number of opening files

wasm: add experimental browser runtime and SDK

output: mitigate heavy loaded case

procesor_content_modifier: Accept list on configure

lib: upgrade bundled jemalloc to 5.4.0

lib: upgrade LuaJIT and fix CMake wrapper compatibility

processor: fuse compatible content modifier chains

processor_sql: preserve resource and scope groups when filtering logs

out_opentelemetry: preserve dropped attribute counts in log exports

processor: isolate CFL codec state across worker invocations

Linear memory growth (reclaimable kernel slab) with `storage.type: filesystem`. POOL proposal.

wasm: filter_wasm: pack value len pair for returned format of wasm

out_s3: make an optional arrow schema option

http_server: in_opentelemetry: plug decompress explosion possibilities

in_prometheus_textfile: append multiple contexts of prometheus texts payloads

http_server: mitigate automatic inflation bypass

tests: fix HTTP JSON stream runtime assertions

filter_kubernetes: mitigate SEGV occurrences on using Use_Kubelet

in_syslog: mitigate potential overflow on payloads

out_file: out_nats: Sanitize malicious tags

http_server: address cumulative bytes on http2 headers

processor_fts: add Fluent Typed Scripting processor

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