OpenTelemetry .NET Runtime Metrics

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Prerequisites

You are successfully sending OpenTelemetry metrics to Datadog.
You have installed the language integration for .NET.
Minimum .NET OTel SDK version of 1.5.0.

OpenTelemetry SDK configuration

If you have instrumented your .NET applications with OpenTelemetry automatic instrumentation, runtime metrics are automatically enabled.

If you have instrumented your .NET application with OpenTelemetry manual instrumentation, see the documentation for the OpenTelemetry.Instrumentation.Runtime library.

The default metric export interval for the .NET OTel SDK is different from the default for the Datadog .NET SDK. Datadog recommends setting the OTEL_METRIC_EXPORT_INTERVAL environment variable on your .NET service to match the default Datadog metric export interval for viewing integration metric graphs:

OTEL_METRIC_EXPORT_INTERVAL=10000

Runtime metric mappings

The following table lists the Datadog runtime metrics that are supported by mapping OpenTelemetry runtime metrics, with “N/A” indicating that there is no OpenTelemetry counterpart.

Datadog metric	Description	OpenTelemetry counterpart
`runtime.dotnet.threads.contention_count`	The number of times a thread stopped to wait on a lock.	`process.runtime.dotnet.` `monitor.lock_contention.count`
`runtime.dotnet.exceptions.count`	The number of first-chance exceptions.	`process.runtime.dotnet.` `exceptions.count`
`runtime.dotnet.gc.size.gen0`	The size of the gen 0 heap.	`process.runtime.dotnet.` `gc.heap.size`
`runtime.dotnet.gc.size.gen1`	The size of the gen 1 heap.	`process.runtime.dotnet.` `gc.heap.size`
`runtime.dotnet.gc.size.gen2`	The size of the gen 2 heap.	`process.runtime.dotnet.` `gc.heap.size`
`runtime.dotnet.gc.size.loh`	The size of the large object heap.	`process.runtime.dotnet.` `gc.heap.size`
`runtime.dotnet.gc.count.gen0`	The number of gen 0 garbage collections.	`process.runtime.dotnet.` `gc.collections.count`
`runtime.dotnet.gc.count.gen1`	The number of gen 1 garbage collections.	`process.runtime.dotnet.` `gc.collections.count`
`runtime.dotnet.gc.count.gen2`	The number of gen 2 garbage collections.	`process.runtime.dotnet.` `gc.collections.count`
`runtime.dotnet.cpu.system`	The number of milliseconds executing in the kernel.	N/A
`runtime.dotnet.cpu.user`	The number of milliseconds executing outside the kernel.	N/A
`runtime.dotnet.cpu.percent`	The percentage of total CPU used by the application.	N/A
`runtime.dotnet.mem.committed`	Memory usage.	N/A
`runtime.dotnet.threads.count`	The number of threads.	N/A
`runtime.dotnet.threads.workers_count`	The number of workers in the threadpool. (.NET Core only)	N/A
`runtime.dotnet.threads.contention_time`	The cumulated time spent by threads waiting on a lock. (.NET Core only)	N/A
`runtime.dotnet.gc.memory_load`	The percentage of the total memory used by the process. The garbage collection (GC) changes its behavior when this value gets above 85. (.NET Core only)	N/A
`runtime.dotnet.gc.pause_time`	The amount of time the GC paused the application threads. (.NET Core only)	N/A
`runtime.dotnet.aspnetcore.` `requests.total`	The total number of HTTP requests received by the server. (.NET Core only)	N/A
`runtime.dotnet.aspnetcore.` `requests.failed`	The number of failed HTTP requests received by the server. (.NET Core only)	N/A
`runtime.dotnet.aspnetcore.` `requests.current`	The total number of HTTP requests that have started but not yet stopped. (.NET Core only)	N/A
`runtime.dotnet.aspnetcore.` `requests.queue_length`	The current length of the server HTTP request queue. (.NET Core only)	N/A
`runtime.dotnet.aspnetcore.` `connections.total`	The total number of HTTP connections established to the server. (.NET Core only)	N/A
`runtime.dotnet.aspnetcore.` `connections.current`	The current number of active HTTP connections to the server. (.NET Core only)	N/A
`runtime.dotnet.aspnetcore.` `connections.queue_length`	The current length of the HTTP server connection queue. (.NET Core only)	N/A