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environment_variables.md

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The CLR Instrumentation Engine Environment Variables

See Configuration for details on how to setup your Instrumentation Method.

Required Variables

These are the environment variables and values that are required to enable the CLR Instrumentation Engine:

Variable Value Description
COR_ENABLE_PROFILING 1 The CLR will only connect to a profiler if this is set to 1 (true).
COR_PROFILER "{324F817A-7420-4E6D-B3C1-143FBED6D855}" The CLR will search for the CLSID or ProgID specified.
COR_PROFILER_PATH_32 (see below) "[FULL PATH TO MicrosoftInstrumentationEngine_x86.dll or InstrumentationEngine.ProfilerProxy_x86.dll]" Skips the registry lookup, uses the 32bit dll from the path.
COR_PROFILER_PATH_64 (see below) "[FULL PATH TO MicrosoftInstrumentationEngine_x64.dll or InstrumentationEngine.ProfilerProxy_x64.dll]" Skips the registry lookup, uses the 64bit dll from the path.

Alternatively, for CoreCLR:

Variable Value Description
CORECLR_ENABLE_PROFILING 1 The CoreCLR will only connect to a profiler if this is set to 1 (true).
CORECLR_PROFILER "{324F817A-7420-4E6D-B3C1-143FBED6D855}" The CoreCLR will search for the CLSID or ProgID specified.
CORECLR_PROFILER_PATH_32 (see below) "[FULL PATH TO MicrosoftInstrumentationEngine_x86.dll or InstrumentationEngine.ProfilerProxy_x86.dll]" Skips the registry lookup, uses the 32bit dll from the path.
CORECLR_PROFILER_PATH_64 (see below) "[FULL PATH TO MicrosoftInstrumentationEngine_x64.dll or InstrumentationEngine.ProfilerProxy_x64.dll]" Skips the registry lookup, uses the 64bit dll from the path.

Please see Profiler Proxy for details on using the Profiler Proxy dll. We recommend setting the COR_PROFILER variables to the proxy whenever applicable since it redirects to the latest CLRIE installed on every process re/start.

Additional variables needed to make the CLR Instrumentation Engine work:

Variable Value Description
MicrosoftInstrumentationEngine_LogLevel "Errors|Messages|Dumps|All" Filters logs. Currently only "Errors" is allowed for EventLogging to prevent verbose logging.
MicrosoftInstrumentationEngine_LogLevel_GUID "Errors|Messages|Dumps|All" Filters logs for InstrumentationMethods. Currently only "Errors" is allowed to prevent verbose logging.

Optional and Miscellaneous Variables

These are the environment variables and values that aid in troubleshooting the CLR Instrumentation Engine:

Variable Value Description
MicrosoftInstrumentationEngine_DebugWait 1 Suspends the process until the debugger is attached.
MicrosoftInstrumentationEngine_FileLogPath "[FULL PATH TO LOGGING FILE]" File to host the event logs. This requires LogLevel to be set.
MicrosoftInstrumentationEngine_DisableCodeSignatureValidation 1 Disables signature validation
MicrosoftInstrumentationEngine_IsPreinstalled 1 The preinstalled site extension for CLRIE sets this to help users know that the applicationHost.xdt file for the preinstalled extension was applied. The Application Insights private site extension won't set this.
MicrosoftInstrumentationEngine_LatestPath D:\Program Files (x86)\SiteExtensions\InstrumentationEngine\[LATEST VERSION] This environment variable is available in Azure App Service v91+ and allows private site extensions to reference the path to the latest preinstalled InstrumentationEngine.

Raw Profiler Hook

The RawProfilerHook allows one additional profiler that has not yet on-boarded to the ClrInstrumentationEngine to work with the Instrumentation Methods.

Variable Value Description
MicrosoftInstrumentationEngine_RawProfilerHook "{GUID}" This would be the value set to CORECLR/COR_PROFILER.
MicrosoftInstrumentationEngine_RawProfilerHookPath_32/64 "[FULL PATH TO raw profiler dll]" This would be the value set to CORECLR/COR_PROFILER_PATH_32/64.

Deprecated as of Version 1.0.22

The following variables allowed custom ExtensionHosts for the InstrumentationEngine. The responsibility of the ExtensionsHost involves setting logging flags and loading Instrumentation Methods.

These variables are deprecated in favor of the default ExtensionsHost implementation to promote collaboration around one protocol for onboarding Instrumentation Methods.

Variable Value Description
MicrosoftInstrumentationEngine_Host "{CA487940-57D2-10BF-11B2-A3AD5A13CBC0}" CLSID or ProgID of the IProfileManagerHost implementation which registers for raw COR profiler callbacks and handles configuration information about instrumentation methods that is passed back.
MicrosoftInstrumentationEngine_HostPath_32 "[FULL PATH TO Microsoft.InstrumentationEngine.ExtensionsHost_x86.dll]" The 32bit dll hosting the implementation.
MicrosoftInstrumentationEngine_HostPath_64 "[FULL PATH TO Microsoft.InstrumentationEngine.ExtensionsHost_x64.dll]" The 64bit dll hosting the implementation.