opentelemetry-collector

Images and binaries here: https://github.com/open-telemetry/opentelemetry-collector-releases/releases/tag/v0.155.0

End User Changelog

🛑 Breaking changes 🛑

• pkg/confighttp: Remove stabilized gate confighttp.framedSnappy (#15420)
• pkg/configoptional: Remove stabilized gate configoptional.AddEnabledField. (#15421)
• pkg/confmap: Remove stabilized featuregate confmap.newExpandedValueSanitizer (#15418)
• pkg/exporterhelper: Remove stable gate exporter.PersistRequestContext. (#15424)
• pkg/otelcol: Remove stable gate otelcol.printInitialConfig (#15425)
• pkg/service: Remove stable featuregate telemetry.UseLocalHostAsDefaultMetricsAddress (#15419)
• pkg/xpdata: Remove stable gate pdata.enableRefCounting. (#15426)
• processor/memory_limiter: Rename deprecated memory limiter metrics to include the memory_limiter prefix (e.g. otelcol_processor_memory_limiter_*) to clarify they are specific to this processor. (#11203)

🚀 New components 🚀

• cmd/schemagen: Move the schemagen CLI from opentelemetry-collector-contrib to this repository as cmd/schemagen. (#14543)
  The tool's source is identical to the upstream contrib version
  (github.com/open-telemetry/opentelemetry-collector-contrib/cmd/schemagen) except for the module path and
  the test fixtures' namespace, which now reflect the collector module
  (go.opentelemetry.io/collector/cmd/schemagen). A contrib-only integration test that pointed at three
  contrib components is removed; contrib's existing make generate-schemas + git-diff CI continues to
  exercise the FactoryMaps feature against real-world components.

💡 Enhancements 💡

• cmd/mdatagen: Add support for versioned metrics (#15309)
  Allows metadata to specify versioned metrics for migrating to new semantic conventions.
  There are two scenarios catered for when the metric name stays the same during migration.
  When a metric name stays the same but its type differs, just the latest metric is
  emitted with the new type.
  When a metric name stays the same but its attributes differ, the latest version
  is emitted with combined attributes during the migration period.

• cmd/schemagen: Add overlayFile support to deep-merge hand-curated schema fragments into generated schemas. (#14543)
  Components can declare an overlayFile in .schemagen.yaml pointing to a YAML file
  whose keys are recursively merged into the auto-generated schema after generation.
  This allows injecting descriptions, constraints, or additional properties that cannot
  be derived from Go types.
  Originally added to the contrib copy of cmd/schemagen in
  open-telemetry/opentelemetry-collector-contrib#48917 and brought over with the tool
  in this move.

• cmd/schemagen: Add -p flag to specify a custom Go package pattern for the config struct. (#14543)
  The new -p flag lets callers override the default . package pattern with an arbitrary
  Go package selector (e.g. a sub-package whose Config type schemagen should walk).
  Originally added to the contrib copy of cmd/schemagen in
  open-telemetry/opentelemetry-collector-contrib#48966 and brought over with the tool
  in this move.

🧰 Bug fixes 🧰

• cmd/mdatagen: Fix an issue when the last feature gate is removed, stale files are left. (#15423)
• cmd/mdatagen: Fix known acronyms at the end of generated Go identifiers to be all-caps, same as in any other position (#15438)
• cmd/schemagen: Fix mode detection when using -p to target a package outside the current directory. (#15453)
  A new -m component|package flag is available as a manual override when auto-detection is not possible.

API Changelog

🛑 Breaking changes 🛑

• cmd/mdatagen: Remove the reaggregation_enabled metadata setting and always generate per-metric reaggregation config. (#15305)
  Legacy metadata files that still contain reaggregation_enabled are accepted, but the value is ignored.

🚩 Deprecations 🚩

• pkg/service: Deprecate service.Settings.CollectorConf and extensioncapabilities.ConfigWatcher in favor of service.Settings.ConfigSnapshot and extensioncapabilities.ConfigSnapshotWatcher, which provide effective and unexpanded configuration representations. (#15432)

💡 Enhancements 💡

• pkg/config/configmiddleware: Migrated middleware config to schema based (#15440)
• pkg/pdata: Add DisallowUnknownFields option to JSONUnmarshaler in plog, ptrace, pmetric, pprofile, and xpdata to error on JSON fields not defined by the OTLP schema. (#15279)
  When DisallowUnknownFields is false (the default), unknown fields are silently ignored, matching the previous behavior.
  Warning: enabling this option breaks forwards compatibility with future evolutions of the OTLP format, as fields added to the format in newer versions will be rejected as unknown.

🧰 Bug fixes 🧰

• cmd/mdatagen: Fix known acronyms at the end of generated Go identifiers to be all-caps, same as in any other position (#15438)