Metrics collected by the Splunk Distribution of OpenTelemetry .NET 🔗

The Splunk Distribution of OpenTelemetry .NET can collect runtime and trace metrics. To learn about the different metric types, see Metric types.

Configure metrics collection 🔗

Metric collection is activated by default. To configure metric settings, see Instrumentation settings.

.NET runtime metrics 🔗

The Splunk Distribution of OpenTelemetry .NET can collect the following runtime metrics:

Metric	Type	Description
`process.runtime.dotnet.gc.collections.count`	Cumulative counter	Number of garbage collections since the process started.
`process.runtime.dotnet.gc.heap.size`	Gauge	Heap size, as observed during the last garbage collection. Only available for .NET 6 or higher.
`process.runtime.dotnet.gc.heap.fragmentation.size`	Gauge	Heap fragmentation, as observed during the last garbage collection. Only available for .NET 7 or higher.
`process.runtime.dotnet.gc.objects.size`	Gauge	Count of bytes currently in use by live objects in the GC heap.
`process.runtime.dotnet.gc.allocations.size`	Cumulative counter	Count of bytes allocated on the managed GC heap since the process started. Only available for .NET 6 or higher.
`process.runtime.dotnet.gc.committed_memory.size`	Gauge	Amount of committed virtual memory for the managed GC heap, as observed during the last garbage collection. Only available for .NET 6 and higher.
`process.runtime.dotnet.gc.duration`	Cumulative counter	The total amount of time paused in GC since the process start. Only available for .NET 7 and higher.
`process.runtime.dotnet.monitor.lock_contention.count`	Cumulative counter	Contentions count when trying to acquire a monitor lock since the process started.
`process.runtime.dotnet.thread_pool.threads.count`	Gauge	Number of thread pool threads, as observed during the last measurement. Only available for .NET 6 or higher.
`process.runtime.dotnet.thread_pool.completed_items.count`	Cumulative counter	Number of work items processed by the thread pool since the process started. Only available for .NET 6 or higher.
`process.runtime.dotnet.thread_pool.queue.length`	Gauge	Number of work items currently queued for processing by the thread pool. Only available for .NET 6 or higher.
`process.runtime.dotnet.jit.il_compiled.size`	Cumulative counter	Bytes of intermediate language that have been compiled since the process started. Only available for .NET 6 or higher.
`process.runtime.dotnet.jit.methods_compiled.count`	Cumulative counter	Number of times the JIT compiler compiled a method since the process started. Only available for .NET 6 or higher.
`process.runtime.dotnet.jit.compilation_time`	Cumulative counter	Amount of time the compiler spent compiling methods since the process started. Only available for .NET 6 or higher.
`process.runtime.dotnet.timer.count`	Gauge	Number of timer instances currently active. Only available for .NET 6 or higher.
`process.runtime.dotnet.assemblies.count`	Gauge	Number of .NET assemblies that are currently loaded.
`process.runtime.dotnet.exceptions.count`	Cumulative counter	Count of exceptions thrown in managed code since the observation started.

Process metrics 🔗

The Splunk Distribution of OpenTelemetry .NET can collect the following process metrics:

Metric	Type	Description
`process.memory.usage`	Gauge	The amount of physical memory allocated for this process.
`process.memory.virtual`	Gauge	The amount of committed virtual memory for this process.
`process.cpu.time`	Cumulative counter	Total CPU seconds broken down by different states, such as user and system.
`process.cpu.count`	Gauge	Total CPU seconds broken down by different states, such as user and system.
`process.threads`	Gauge	Process threads count.

Instrumentation metrics 🔗

The Splunk Distribution of OpenTelemetry .NET can collect the following instrumentation metrics:

ASP.NET Core 🔗

Metric	Type	Description
`http.server.duration_{bucket\|count\|sum}`	Cumulative counters (histogram)	Duration of the inbound HTTP request, in the form of count, sum, and histogram buckets. This metric originates multiple metric time series, which might result in increased data ingestion costs. Supported only on .NET prior to 8.
`http.server.active_requests`	Gauge	Number of active HTTP server requests. Supported only on .NET8+.
`http.server.request.duration_{bucket\|count\|sum}`	Cumulative counters (histogram)	Duration of HTTP server requests. Supported only on .NET8+.
`kestrel.active_connections`	Gauge	Number of connections that are currently active on the server. Supported only on .NET8+.
`kestrel.connection.duration_{bucket\|count\|sum}`	Cumulative counters (histogram)	The duration of connections on the server. Supported only on .NET8+.
`kestrel.rejected_connections`	Cumulative counters	Number of connections rejected by the server. Connections are rejected when the currently active count exceeds the value configured with MaxConcurrentConnections. Supported only on .NET8+.
`kestrel.queued_connections`	Gauge	Number of connections that are currently queued and are waiting to start. Supported only on .NET8+.
`kestrel.queued_requests`	Gauge	Number of HTTP requests on multiplexed connections (HTTP/2 and HTTP/3) that are currently queued and are waiting to start. Supported only on .NET8+.
`kestrel.upgraded_connections`	Gauge	Number of HTTP connections that are currently upgraded (WebSockets). The number only tracks HTTP/1.1 connections. Supported only on .NET8+.
`kestrel.tls_handshake.duration_{bucket\|count\|sum}`	Cumulative counters (histogram)	The duration of TLS handshakes on the server. Supported only on .NET8+.
`kestrel.active_tls_handshakes`	Gauge	Number of TLS handshakes that are currently in progress on the server. Supported only on .NET8+.
`signalr.server.connection.duration_{bucket\|count\|sum}`	Cumulative counters (histogram)	The duration of connections on the server. Supported only on .NET8+.
`signalr.server.active_connections`	Gauge	Number of connections that are currently active on the server. Supported only on .NET8+.
`aspnetcore.routing.match_attempts`	Cumulative counters	Number of requests that were attempted to be matched to an endpoint. Supported only on .NET8+.
`aspnetcore.diagnostics.exceptions`	Cumulative counters	Number of exceptions caught by exception handling middleware. Supported only on .NET8+.
`aspnetcore.rate_limiting.active_request_leases`	Gauge	Number of HTTP requests that are currently active on the server that hold a rate limiting lease. Supported only on .NET8+.
`aspnetcore.rate_limiting.request_lease.duration_{bucket\|count\|sum}`	Cumulative counters (histogram)	The duration of rate limiting leases held by HTTP requests on the server. Supported only on .NET8+.
`aspnetcore.rate_limiting.queued_requests`	Gauge	Number of HTTP requests that are currently queued, waiting to acquire a rate limiting lease. Supported only on .NET8+.
`aspnetcore.rate_limiting.request.time_in_queue_{bucket\|count\|sum}`	Cumulative counters (histogram)	The duration of HTTP requests in a queue, waiting to acquire a rate limiting lease. Supported only on .NET8+.
`aspnetcore.rate_limiting.requests`	Cumulative counters	Number of requests that tried to acquire a rate limiting lease. Requests could be rejected by global or endpoint rate limiting policies. Or the request could be canceled while waiting for the lease. Supported only on .NET8+.

HTTP Client 🔗

Metric	Type	Description
`http.client.duration_{bucket\|count\|sum}`	Cumulative counters (histogram)	Duration of outbound HTTP requests, in the form of count, sum, and histogram buckets. This metric originates multiple metric time series, which might result in increased data ingestion costs. Supported only on .NET prior to 8.
`http.client.active_requests`	Gauge	Number of outbound HTTP requests that are currently active on the client. Supported only on .NET8+.
`http.client.request.duration_{bucket\|count\|sum}`	Cumulative counters (histogram)	Duration of HTTP client requests. Supported only on .NET8+.
`http.client.open_connections`	Gauge	Number of outbound HTTP connections that are currently active or idle on the client. Supported only on .NET8+.
`http.client.connection.duration_{bucket\|count\|sum}`	Cumulative counters (histogram)	The duration of successfully established outbound HTTP connections. Supported only on .NET8+.
`http.client.request.time_in_queue_{bucket\|count\|sum}`	Cumulative counters (histogram)	The amount of time requests spent on a queue waiting for an available connection. Supported only on .NET8+.
`dns.lookup.duration_{bucket\|count\|sum}`	Cumulative counters (histogram)	Measures the time taken to perform a DNS lookup. Supported only on .NET8+.

NServiceBus 🔗

Metric	Type	Description
`nservicebus.messaging.successes`	Cumulative counter	Number of messages successfully processed by the endpoint.
`nservicebus.messaging.fetches`	Cumulative counter	Number of messages retrieved from the queue by the endpoint.
`nservicebus.messaging.failures`	Cumulative counter	Number of messages unsuccessfully processed by the endpoint.

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