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opentelemetry-dotnet-instru.../docs/internal/config.md

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Configuration

This document lists advanced configuration settings rarely changed by users.

Environment

Environment variable Description Default value
OTEL_DOTNET_AUTO_AZURE_APP_SERVICES Set to indicate that the profiler is running in the context of Azure App Services. false

Diagnostics

Environment variable Description Default value
OTEL_DOTNET_AUTO_DUMP_ILREWRITE_ENABLED Lets the profiler dump the IL original code and modification to the log. false

CLR Optimizations

Bytecode instrumentations are implemented by registering a CLR Profiler, receiving notifications from the .NET runtime, and rewriting methods at runtime to invoke the appropriate instrumentation. The CLR Profiler components of this library have been authored to run with as much of the CLR optimizations enabled as possible, but under rare circumstances it is possible that the optimizations have caused rewriting not to run, resulting in missing spans. To determine whether CLR optimizations are affecting instrumentations, you may set the following configurations to modify CLR optimizations.

Environment variable Description Default value
OTEL_DOTNET_AUTO_CLR_DISABLE_OPTIMIZATIONS Set to true to disable all JIT optimizations. false
OTEL_DOTNET_AUTO_CLR_ENABLE_INLINING Set to false to disable JIT inlining. true
OTEL_DOTNET_AUTO_CLR_ENABLE_NGEN Set to false to disable NGEN images. true