Fluent Bit v5.2.0

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Due by November 9, 2026

•Last updated Nov 3, 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
output: engine: output_throttle: Implement throttle operations for output plugins
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#12393 opened Sep 9, 2026 · Updated Oct 26, 2026
34
in_tail: Implement budget for max number of opening files
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#12441 opened Sep 18, 2026 · Updated Sep 28, 2026
7
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
out_opentelemetry: preserve dropped attribute counts in log exports
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#12507 opened Oct 2, 2026 · Updated Nov 2, 2026
5
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 21, 2026
9
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
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
out_pgsql: loading libpg library as dynamic
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#12633 opened Oct 22, 2026 · Updated Nov 3, 2026
5
tls: propagate verify_hostname settings on tls context
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#12635 opened Oct 22, 2026 · Updated Oct 26, 2026
8
in_node_exporter_metrics: add scrape_on_start option
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#12638 opened Oct 22, 2026 · Updated Oct 23, 2026
12
http_client: out_opentelemetry: mitigate unbounded http ng requests
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#12665 opened Oct 26, 2026 · Updated Oct 26, 2026
9
bin: generate YAML configuration from CLI options
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#12353 opened Sep 1, 2026 · Updated Oct 26, 2026
9
out_file: Mitigated the File output cardinality gap
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#12676 opened Oct 28, 2026 · Updated Oct 28, 2026
2
tests: integeration: config_format: address newer python failures and windows failures on integration tests
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#12677 opened Oct 28, 2026 · Updated Oct 28, 2026
7
utils: plugins: Implemented the path-shadowing mitigation for shadowed relative files
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#12682 opened Oct 29, 2026 · Updated Oct 29, 2026
4
oauth2_jwt: in_http: in_opentelemetry: Implement configurable OAuth2 jwks buffer size and its limit
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#12694 opened Oct 30, 2026 · Updated Oct 31, 2026
8
http_server: keep cached metrics when a push overlaps a read
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#12684 opened Oct 29, 2026 · Updated Oct 30, 2026
6

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Fluent Bit v5.2.0

out_vivo_exporter: fix telemetry loss and add compressed OTLP JSON

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

in_tail: Implement budget for max number of opening files

output: mitigate heavy loaded case

procesor_content_modifier: Accept list on configure

out_opentelemetry: preserve dropped attribute counts in log exports

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

in_syslog: mitigate potential overflow on payloads

out_file: out_nats: Sanitize malicious tags

out_pgsql: loading libpg library as dynamic

tls: propagate verify_hostname settings on tls context

in_node_exporter_metrics: add scrape_on_start option

http_client: out_opentelemetry: mitigate unbounded http ng requests

bin: generate YAML configuration from CLI options

out_file: Mitigated the File output cardinality gap

tests: integeration: config_format: address newer python failures and windows failures on integration tests

utils: plugins: Implemented the path-shadowing mitigation for shadowed relative files

oauth2_jwt: in_http: in_opentelemetry: Implement configurable OAuth2 jwks buffer size and its limit

http_server: keep cached metrics when a push overlaps a read

Issues