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CHANGELOG.md

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Changelog

vNext

Fixes 1682. "spec_unstable_logs_enabled" feature now do not suppress logs for other layers.

The special treatment of the "message" field has been extended when recording string values. With this change, when a log is emitted with a field named "message" (and string value), its value is directly assigned to the LogRecord’s body rather than being stored as an attribute named "message". This offers a slight performance improvement over previous.

For example, the below will now produce LogRecord with the message value populated as LogRecord's body:

error!(name: "my-event-name", target: "my-system", event_id = 20, user_name = "otel", user_email = "otel@opentelemetry.io", message = "This is an example message");

Previously, Body was only populated when the below style was used.

error!(name: "my-event-name", target: "my-system", event_id = 20, user_name = "otel", user_email = "otel@opentelemetry.io", "This is an example message");

This style, while slightly slower, should still be used when the value is not a simple string, but require format arguments as in the below example.

error!(name: "my-event-name", target: "my-system", event_id = 20, user_name = "otel", user_email = "otel@opentelemetry.io", "This is an example message with format arguments {} and {}", "foo", "bar");

Fixes 2658 InstrumentationScope(Logger) used by the appender now uses an empty ("") named Logger. Previously, a Logger with name and version of the crate was used. Receivers (processors, exporters) are expected to use LogRecord.target() as scope name. This is already done in OTLP Exporters, so this change should be transparent to most users.

  • Passes event name to the event_enabled method on the Logger. This allows implementations (SDK, processor, exporters) to leverage this additional information to determine if an event is enabled.

0.28.1

Released 2025-Feb-12

  • New experimental feature to use trace_id & span_id from spans created through the tracing crate (experimental_use_tracing_span_context) #2438

0.28.0

Released 2025-Feb-10

  • Update opentelemetry dependency version to 0.28.
  • Bump msrv to 1.75.0.

0.27.0

Released 2024-Nov-11

  • Update opentelemetry dependency version to 0.27

  • Bump MSRV to 1.70 #2179

  • Breaking 2291 Rename logs_level_enabled flag to spec_unstable_logs_enabled. Please enable this updated flag if the feature is needed. This flag will be removed once the feature is stabilized in the specifications.

v0.26.0

Released 2024-Sep-30

  • Update opentelemetry dependency version to 0.26
  • 2101 The log events emitted via the tracing pipeline using the log-tracing crate no longer include the target metadata as attributes. Exporters or backends that rely on this attribute should now access the target directly from the LogRecord::target field.

v0.25.0

  • Update opentelemetry dependency version to 0.25
  • Starting with this version, this crate will align with opentelemetry crate on major,minor versions.
  • Reduce heap allocation by using &'static str for SeverityText.

v0.5.0

  • 1869 Utilize the LogRecord::set_target() method to pass the tracing target to the SDK. Exporters might use the target to override the instrumentation scope, which previously contained "opentelemetry-appender-tracing".

  • Breaking 1928 Insert tracing event name into LogRecord::event_name instead of attributes.

    • If using a custom exporter, then they must serialize this field directly from LogRecord::event_name instead of iterating over the attributes. OTLP Exporter is modified to handle this.

  • Update opentelemetry dependency version to 0.24

v0.4.0

  • Removed unwanted dependency on opentelemetry-sdk.
  • Update opentelemetry dependency version to 0.23

v0.3.0

Added

  • New experimental metadata attributes feature (experimental_metadata_attributes) #1380
    • Experimental new attributes for tracing metadata
    • Fixes the following for events emitted using log crate
      • Normalized metadata fields
      • Remove redundant metadata

v0.2.0

Changed

  • Bump MSRV to 1.65 #1318

Added

  • Add log appender versions to loggers (#1182)

v0.1.0

Initial crate release