core-1.7.0-alpha.1

OpenTelemetry

• Update AggregatorStore to reclaim unused MetricPoints for Delta aggregation temporality. (#4486)

• Fixed a bug where TracerProviderBuilderBase was not invoking the instrumentationFactory delegate passed to the protected
AddInstrumentation method. (#4873)

• Allowed metric instrument names to contain / characters. (#4882)

• Breaking Change [Tracer|Meter|Logger]ProviderBuilder.Build extension will now throw a NotSupportedException if invoked on a non-SDK builder type. Previously it would return null. (#4885)

• Updated Microsoft.Extensions.Logging package version to 8.0.0-rc.1.23419.4. (#4920, #4933)

OpenTelemetry.Api

• Fixed a bug which caused Tracer.StartRootSpan to generate a child span if a trace was running (Activity.Current != null). (#4890)

• Added a Tracer cache inside of TracerProvider to prevent repeated calls to GetTracer from leaking memory. (#4906)

• Fix TraceContextPropagator by validating the first digit of the hex-encoded trace-flags field of the traceparent header. (#4893)

OpenTelemetry.Exporter.OpenTelemetryProtocol

• Bumped the version of Google.Protobuf used by the project to 3.22.5 so that consuming applications can be published as NativeAOT successfully. Also, a new performance feature can be used instead of reflection emit, which is not AOT-compatible. Removed the dependency on System.Reflection.Emit.Lightweight. (#4859)

• Added support for OTEL_LOGRECORD_ATTRIBUTE_VALUE_LENGTH_LIMIT and OTEL_LOGRECORD_ATTRIBUTE_COUNT_LIMIT. (#4887)

• Added ability to export attributes corresponding to LogRecord.Exception i.e. exception.type, exception.message and exception.stacktrace. These attributes will be exported when OTEL_DOTNET_EXPERIMENTAL_OTLP_EMIT_EXCEPTION_LOG_ATTRIBUTES environment variable will be set to true.

  NOTE: These attributes were removed in 1.6.0-rc.1 release in order to support stable release of OTLP Log Exporter. The attributes will now be available via environment variable mentioned above. (#4892)

• Added ability to export attributes corresponding to LogRecord.EventId.Id as logrecord.event.id and LogRecord.EventId.Name as logrecord.event.name. The attributes will be exported when OTEL_DOTNET_EXPERIMENTAL_OTLP_EMIT_EVENT_LOG_ATTRIBUTES will be set to true.

  NOTE: These attributes were removed in 1.6.0-rc.1 release in order to support stable release of OTLP Log Exporter. The attributes will now be available via environment variable mentioned above. (#4925)

• LogRecord.CategoryName will now be exported as InstrumentationScope name field under ScopeLogs. (#4941)

OpenTelemetry.Exporter.Prometheus.AspNetCore

• Fixed writing boolean values to use the JSON representation (#4823)

OpenTelemetry.Exporter.Prometheus.HttpListener

• Fixed writing boolean values to use the JSON representation (#4823)

OpenTelemetry.Extensions.Hosting

• Changed the behavior of the OpenTelemetryBuilder.AddOpenTelemetry extension to INSERT OpenTelemetry services at the beginning of the IServiceCollection in an attempt to provide a better experience for end users capturing telemetry in hosted services. Note that this does not guarantee that OpenTelemetry services will be initialized while other hosted services start, so it is possible to miss telemetry until OpenTelemetry services are fully initialized. (#4883)