build: add options for plugins at group granularity

[RaJiska]

Add FLB_ALL_INPUTS, FLB_ALL_PROCESSORS, FLB_ALL_FILTERS, and FLB_ALL_OUTPUTS options to control the build for each plugins group individually.

Three options for each variable:

• Inherit: Default, doesn't do anything.
• On: Plugins for the entire group enabled.
• Off: Plugins for the entire group disabled.

Respects precedence from least to most specific (right overrides left):

  FLB_MINIMAL => FLB_ALL_* => Individual Option

e.g to disable everything except outputs and HTTP input:

  -DFLB_MINIMAL=On -DFLB_ALL_OUTPUTS=On -DFLB_IN_HTTP=On

The above configuration results in:

$ docker run --rm -it tmp /fluent-bit/bin/fluent-bit --help
[...]

Inputs
  http                    HTTP

Processors

Filters

Outputs
  azure                   Send events to Azure HTTP Event Collector
  azure_blob              Azure Blob Storage
  azure_logs_ingestion    Send logs to Log Analytics with Log Ingestion API
  azure_kusto             Send events to Kusto (Azure Data Explorer)
  bigquery                Send events to BigQuery via streaming insert
  counter                 Records counter
  datadog                 Send events to DataDog HTTP Event Collector
  es                      Elasticsearch
  exit                    Exit after a number of flushes (test purposes)
  file                    Generate log file
  forward                 Forward (Fluentd protocol)
  http                    HTTP Output
  influxdb                InfluxDB Time Series
  logdna                  LogDNA
  loki                    Loki
  kafka                   Kafka
  kafka-rest              Kafka REST Proxy
  nats                    NATS Server
  nrlogs                  New Relic
  null                    Throws away events
  opensearch              OpenSearch
  oracle_log_analytics    Oracle log analytics
  plot                    Generate data file for GNU Plot
  pgsql                   PostgreSQL
  retry                   Issue a retry upon flush request
  skywalking              Send logs into log collector on SkyWalking OAP
  slack                   Send events to a Slack channel
  splunk                  Send events to Splunk HTTP Event Collector
  stackdriver             Send events to Google Stackdriver Logging
  stdout                  Prints events to STDOUT
  syslog                  Syslog
  tcp                     TCP Output
  udp                     UDP Output
  td                      Treasure Data
  flowcounter             FlowCounter
  gelf                    GELF Output
  websocket               Websocket
  cloudwatch_logs         Send logs to Amazon CloudWatch
  kinesis_firehose        Send logs to Amazon Kinesis Firehose
  kinesis_streams         Send logs to Amazon Kinesis Streams
  opentelemetry           OpenTelemetry
  prometheus_exporter     Prometheus Exporter
  prometheus_remote_write Prometheus remote write
  s3                      Send to S3
  vivo_exporter           Vivo Exporter
  chronicle               Send logs to Google Chronicle as unstructured log

[...]

---

Enter [N/A] in the box, if an item is not applicable to your change.

Testing
Before we can approve your change; please submit the following in a comment:

• Example configuration file for the change
• [N/A] Debug log output from testing the change

• [N/A] Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• Documentation required for this feature

fluent/fluent-bit-docs#2632

Backporting

• [N/A] Backport to latest stable release.

---

Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

New Features

• Added group-level controls for enabling or disabling all input, processor, filter, or output plugins.
• Each group supports On, Off, or Inherit settings, allowing broad defaults while preserving individual plugin choices.
• Explicitly configured plugin options remain unchanged when group defaults are applied.
• Configuration values are validated to ensure only supported settings are accepted.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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• cmake/plugins_options.cmake

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• cmake/plugins_options.cmake

---

📝 Walkthrough

Walkthrough

Changes

The CMake plugin options module adds validated On, Off, and Inherit controls for Inputs, Processors, Filters, and Outputs. It applies group settings while preserving explicitly pinned cache options.

Plugin group overrides

Layer / File(s)	Summary
Define group override behavior cmake/plugins_options.cmake	DEFINE_OPTION normalizes group overrides, preserves pinned options, tracks inherited values, and validates four group-level cache variables.
Wire overrides to plugin sections cmake/plugins_options.cmake	Each plugin section assigns its group override before declarations, and the temporary variable is unset after Outputs.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Suggested reviewers: celalettin1286

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding build options for plugins at group granularity.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@cmake/plugins_options.cmake`:
- Around line 6-9: Update the plugin option setup around FLB_GROUP_OVERRIDE and
option() so inherited options are refreshed from the current group setting when
FLB_ALL_* changes during reconfiguration, while explicitly selected plugin
overrides remain unchanged. Ensure the cache-backed option is force-updated only
for inherited values, preserving the existing option_name, description, and
override behavior.
- Around line 16-23: The FLB_ALL_INPUTS, FLB_ALL_PROCESSORS, FLB_ALL_FILTERS,
and FLB_ALL_OUTPUTS cache variables currently accept arbitrary command-line
values. Validate each value immediately after its cache definition against
exactly On, Off, or Inherit, and call message(FATAL_ERROR ...) for any invalid
value before DEFINE_OPTION(...) or option() processing occurs.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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[edsiper]

thanks for the contribution, please resolve the issues reported by the AI review

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@cmake/plugins_options.cmake`:
- Around line 17-30: Update the option inheritance logic in DEFINE_OPTION so an
unpinned option is marked pinned whenever its current value differs from
_FLB_INHERITED_${option_name}, before updating that inherited-value cache entry.
Preserve existing behavior for matching values and ensure later group changes do
not overwrite a diverged individual BOOL override.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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📒 Files selected for processing (1)

• cmake/plugins_options.cmake

[RaJiska]

Thank you @edsiper , fixed the issues.

I left the FLB_WINDOWS_DEFAULTS comment unaddressed as this issue doesn't stem from my changes, it seems like they've been there before. My understanding is that the the windows preset has been set to override whatever is configured either via FLB_MINIMAL, FLB_ALL, or even individual options. Probably something to be addressed in a separate PR? Although I suspect this may be by design.

[patrick-stephens]

Thank you @edsiper , fixed the issues.

I left the FLB_WINDOWS_DEFAULTS comment unaddressed as this issue doesn't stem from my changes, it seems like they've been there before. My understanding is that the the windows preset has been set to override whatever is configured either via FLB_MINIMAL, FLB_ALL, or even individual options. Probably something to be addressed in a separate PR? Although I suspect this may be by design.

You can resolve it by stating that.

[RaJiska]

Done @patrick-stephens , thank you!