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Enable runtime metrics collection in the .NET Tracer 1.23.0+ with the DD_RUNTIME_METRICS_ENABLED=true environment variable.
View runtime metrics in correlation with your .NET services. See the Service Catalog in Datadog.
By default, runtime metrics from your application are sent to the Datadog Agent with DogStatsD over port 8125. Make sure that DogStatsD is enabled for the Agent.
If you are running the Agent as a container, ensure that DD_DOGSTATSD_NON_LOCAL_TRAFFIC is set to true, and that port 8125 is open on the Agent. Additionally, for:
Alternatively, the Agent can ingest metrics with a Unix Domain Socket (UDS) as an alternative to UDP transport. For more information, read DogStatsD over Unix Domain Socket.
The following metrics are collected by default after enabling .NET metrics.
| runtime.dotnet.cpu.system (gauge) | The number of milliseconds executing in the kernel Shown as millisecond |
| runtime.dotnet.cpu.user (gauge) | The number of milliseconds executing outside the kernel Shown as millisecond |
| runtime.dotnet.cpu.percent (gauge) | The percentage of total CPU used by the application Shown as percent |
| runtime.dotnet.mem.committed (gauge) | Memory usage Shown as byte |
| runtime.dotnet.threads.count (gauge) | The number of threads Shown as thread |
| runtime.dotnet.threads.workers_count (gauge) | The number of workers in the threadpool (.NET Core 3.1+ only) Shown as thread |
| runtime.dotnet.threads.contention_time (gauge) | The cumulated time spent by threads waiting on a lock (.NET Core 3.1+ only) Shown as millisecond |
| runtime.dotnet.threads.contention_count (count) | The number of times a thread stopped to wait on a lock |
| runtime.dotnet.exceptions.count (count) | The number of first-chance exceptions Shown as exception |
| runtime.dotnet.gc.size.gen0 (gauge) | The size of the gen 0 heap Shown as byte |
| runtime.dotnet.gc.size.gen1 (gauge) | The size of the gen 1 heap Shown as byte |
| runtime.dotnet.gc.size.gen2 (gauge) | The size of the gen 2 heap Shown as byte |
| runtime.dotnet.gc.size.loh (gauge) | The size of the large object heap Shown as byte |
| runtime.dotnet.gc.memory_load (gauge) | The percentage of the total memory used by the process. The GC changes its behavior when this value gets above 85. (.NET Core 3.1+ only) Shown as percent |
| runtime.dotnet.gc.pause_time (gauge) | The amount of time the GC paused the application threads (.NET Core 3.1+ only) Shown as millisecond |
| runtime.dotnet.gc.count.gen0 (count) | The number of gen 0 garbage collections Shown as garbage collection |
| runtime.dotnet.gc.count.gen1 (count) | The number of gen 1 garbage collections Shown as garbage collection |
| runtime.dotnet.gc.count.gen2 (count) | The number of gen 2 garbage collections Shown as garbage collection |
| runtime.dotnet.aspnetcore.requests.total (gauge) | The total number of HTTP requests received by the server (.NET Core 3.1+ only) Shown as request |
| runtime.dotnet.aspnetcore.requests.failed (gauge) | The number of failed HTTP requests received by the server (.NET Core 3.1+ only) Shown as request |
| runtime.dotnet.aspnetcore.requests.current (gauge) | The total number of HTTP requests that have started but not yet stopped (.NET Core 3.1+ only) Shown as request |
| runtime.dotnet.aspnetcore.requests.queue_length (gauge) | The current length of the server HTTP request queue (.NET 5+ only) Shown as request |
| runtime.dotnet.aspnetcore.connections.total (gauge) | The total number of HTTP connections established to the server (.NET 5+ only) Shown as connection |
| runtime.dotnet.aspnetcore.connections.current (gauge) | The current number of active HTTP connections to the server (.NET 5+ only) Shown as connection |
| runtime.dotnet.aspnetcore.connections.queue_length (gauge) | The current length of the HTTP server connection queue (.NET 5+ only) Shown as connection |
Along with displaying these metrics in your APM Service Page, Datadog provides a default .NET Runtime Dashboard.
On .NET Framework, metrics are collected using performance counters. Users in non-interactive logon sessions (that includes IIS application pool accounts and some service accounts) must be added to the Performance Monitoring Users group to access counter data.
IIS application pools use special accounts that do not appear in the list of users. To add them to the Performance Monitoring Users group, look for IIS APPPOOL\<name of the pool>. For instance, the user for the DefaultAppPool would be IIS APPPOOL\DefaultAppPool.
This can be done either from the “Computer Management” UI, or from an administrator command prompt:
net localgroup "Performance Monitor Users" "IIS APPPOOL\DefaultAppPool" /add
Additional helpful documentation, links, and articles:
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