feat(sdk-logs): Add Logger Configurator API & Trace-based + Min-Severity Filtering #5991

JacksonWeber · 2025-10-07T02:12:29Z

Which problem is this PR solving?

This pull request introduces advanced logger configuration capabilities to the OpenTelemetry JS SDK Logs package. The main feature is the new LoggerConfigurator API, which allows users to filter logs by minimum severity, trace sampling status, and to configure loggers individually using pattern matching. These changes improve flexibility and control over log processing and exporting.

Logger configuration and filtering features

Added the LoggerConfigurator API, enabling users to define per-logger configuration for severity filtering, trace-based filtering, and logger disabling, with pattern matching for logger names. (experimental/packages/sdk-logs/src/config/LoggerConfigurators.ts, experimental/packages/sdk-logs/src/types.ts, experimental/packages/sdk-logs/src/LoggerProvider.ts, experimental/packages/sdk-logs/src/internal/LoggerProviderSharedState.ts) [1] [2] [3] [4] [5] [6]
Updated the Logger class to apply minimum severity and trace-based filtering before emitting log records, dropping logs that don't meet the configured criteria. (experimental/packages/sdk-logs/src/Logger.ts) [1] [2]

Documentation and API updates

Expanded the README.md with detailed documentation and usage examples for the new logger configuration features, including severity and trace-based filtering and per-logger configuration patterns. (experimental/packages/sdk-logs/README.md)
Updated type exports and API surface to include LoggerConfig, LoggerConfigurator, and createLoggerConfigurator. (experimental/packages/sdk-logs/src/index.ts) [1] [2]

Changelog and test updates

Added a changelog entry for the new loggerConfigurator feature. (experimental/CHANGELOG.md)
Updated and expanded tests to cover the new logger configuration and filtering logic. (experimental/packages/sdk-logs/test/common/Logger.test.ts)

Type of change

Please delete options that are not relevant.

New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Unit tests for each type of filtering added

Checklist:

Followed the style guidelines of this project
Unit tests have been added
Documentation has been updated

codecov · 2025-10-07T02:15:37Z

Codecov Report

❌ Patch coverage is 96.55172% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.40%. Comparing base (6cca46e) to head (f1c7fc2).

Files with missing lines	Patch %	Lines
...ackages/sdk-logs/src/config/LoggerConfigurators.ts	95.45%	1 Missing ⚠️
...sdk-logs/src/internal/LoggerProviderSharedState.ts	94.11%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5991   +/-   ##
=======================================
  Coverage   95.40%   95.40%           
=======================================
  Files         317      319    +2     
  Lines        9440     9495   +55     
  Branches     2188     2204   +16     
=======================================
+ Hits         9006     9059   +53     
- Misses        434      436    +2

Files with missing lines	Coverage Δ
experimental/packages/sdk-logs/src/Logger.ts	`100.00% <100.00%> (ø)`
...perimental/packages/sdk-logs/src/LoggerProvider.ts	`100.00% <100.00%> (ø)`
...perimental/packages/sdk-logs/src/internal/utils.ts	`100.00% <100.00%> (ø)`
...ackages/sdk-logs/src/config/LoggerConfigurators.ts	`95.45% <95.45%> (ø)`
...sdk-logs/src/internal/LoggerProviderSharedState.ts	`96.66% <94.11%> (-3.34%)`	⬇️

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pichlermarc

Specification: https://github.com/open-telemetry/opentelemetry-specification/blame/f31acdf68b1c886269ab39011a338a8d72dbebea/specification/logs/sdk.md#L102-L133

@JacksonWeber - please also mark all features that are marked as in-development in the spec as @experimental in the TSdoc. This way we can avoid blocking https://github.com/open-telemetry/opentelemetry-js/milestone/19

JacksonWeber · 2025-10-07T18:05:53Z

Specification: https://github.com/open-telemetry/opentelemetry-specification/blame/f31acdf68b1c886269ab39011a338a8d72dbebea/specification/logs/sdk.md#L102-L133

@JacksonWeber - please also mark all features that are marked as in-development in the spec as @experimental in the TSdoc. This way we can avoid blocking https://github.com/open-telemetry/opentelemetry-js/milestone/19

Experimental features have been marked as such. Thanks for the feedback!

outdated

pichlermarc

Hmm, overall I'm a bit confused by this feature - the spec for it seems still a bit vague and seems to duplicate functionality from existing features. 🤔 That's not this PR's issue, I feel like it's a symptom of a spec that's not quite where we'd need it to be yet.

I suppose the value proposition for having a LoggerConfigurator is to save on allocations in the pipeline - which is important for a hot path like this. (Q: @JacksonWeber is this the motivation for working on this feature?) If that's not the goal, then we could accomplish the same thing today in the LogRecordProcessor.

Though it seems to me that the optimizing LogRecordImpl to avoid expensive operations until it's properties are first accessed, and then applying filtering in the LogRecordProcessor may be a better way to go about it without adding additional concept to the public API.

The Go SIG seems to have a similar stance: open-telemetry/opentelemetry-specification#4644

experimental/packages/sdk-logs/src/Logger.ts

experimental/packages/sdk-logs/src/config/LoggerConfigurators.ts

pichlermarc · 2025-11-26T16:11:44Z

experimental/packages/sdk-logs/src/internal/LoggerProviderSharedState.ts

+  private _getScopeKey(scope: InstrumentationScope): string {
+    return `${scope.name}@${scope.version || ''}:${scope.schemaUrl || ''}`;
  }


suggestion: let's make this a utility function since we don't need to access this here.

Makes sense, I've added a utils folder in the sdk-logs to house this new util function.

experimental/packages/sdk-logs/src/Logger.ts

pichlermarc · 2025-11-26T16:20:24Z

experimental/packages/sdk-logs/src/types.ts

+/**
+ * A LoggerConfig defines various configurable aspects of a Logger's behavior.
+ */
+export interface LoggerConfig {
+  /**
+   * A boolean indication of whether the logger is enabled.
+   * If a Logger is disabled, it behaves equivalently to a No-op Logger.
+   * Defaults to false (loggers are enabled by default).
+   */
+  disabled?: boolean;


I think these two also need an experimental annotation.

Added, thanks for the catch!

experimental/packages/sdk-logs/README.md

JacksonWeber added 2 commits October 6, 2025 16:28

Add loggerConfigurator and tests.

ff06c8a

Update README.md

cfd6b7f

JacksonWeber requested a review from a team as a code owner October 7, 2025 02:12

Update CHANGELOG.md

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pichlermarc previously requested changes Oct 7, 2025

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JacksonWeber added the pkg:sdk-logs label Oct 7, 2025

JacksonWeber added 2 commits October 7, 2025 10:29

Fix lint & add @experimental tags.

c407f31

Update README.md

8e25840

JacksonWeber requested a review from pichlermarc October 7, 2025 18:05

pichlermarc added the spec-feature This is a request to implement a new feature which is already specified by the OTel specification label Oct 8, 2025

pichlermarc reviewed Oct 22, 2025

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experimental/packages/sdk-logs/src/Logger.ts Show resolved Hide resolved

JacksonWeber changed the title ~~feat(sdk-logs): Add loggerConfigurator~~ feat(sdk-logs): Add FilteringLogRecordProcessor Oct 23, 2025

JacksonWeber requested a review from pichlermarc October 23, 2025 18:23

JacksonWeber force-pushed the jacksonweber/logger-sampling branch from 12fb209 to 8e25840 Compare November 13, 2025 01:36

JacksonWeber added 3 commits November 12, 2025 17:39

Merge branch 'main' into jacksonweber/logger-sampling

319ec0a

Update Logger.test.ts

681fc14

Update Logger.test.ts

c822cc3

JacksonWeber changed the title ~~feat(sdk-logs): Add FilteringLogRecordProcessor~~ feat(sdk-logs): Add Logger Configurator API & Trace-based + Min-Severity Filtering Nov 13, 2025

JacksonWeber added 3 commits November 13, 2025 13:05

Merge branch 'main' into jacksonweber/logger-sampling

0dc7941

Merge branch 'main' into jacksonweber/logger-sampling

2029cc7

Merge branch 'main' into jacksonweber/logger-sampling

93553aa

JacksonWeber mentioned this pull request Nov 18, 2025

Allow filtering logs being sent to AppInsights by log level Azure/azure-sdk-for-js#36456

Open

pichlermarc self-assigned this Nov 19, 2025

JacksonWeber added 4 commits November 19, 2025 14:17

Merge branch 'main' into jacksonweber/logger-sampling

38bebd8

Merge branch 'main' into jacksonweber/logger-sampling

8cc9360

Merge branch 'main' into jacksonweber/logger-sampling

6e9324b

Merge branch 'main' into jacksonweber/logger-sampling

3cf69a5

Merge branch 'main' into jacksonweber/logger-sampling

bf23a55

pichlermarc reviewed Nov 26, 2025

View reviewed changes

JacksonWeber added 5 commits November 26, 2025 13:38

Add support for caching the config in the logger.

2e9091c

Add further experimental annotations.

8b5850e

Create getInstrumentationScopeKey utils function.

756bee4

Add further experimental flags.

13e96a7

Fix lint.

d6cf204

JacksonWeber requested a review from pichlermarc November 26, 2025 22:04

Merge branch 'main' into jacksonweber/logger-sampling

f1c7fc2

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Which problem is this PR solving?

Logger configuration and filtering features

Documentation and API updates

Changelog and test updates

Type of change

How Has This Been Tested?

Checklist:

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