OpenTelemetry Runtime Metrics

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Overview

Runtime metrics provide insights into application performance, including memory usage, garbage collection, and parallelization. Datadog tracing libraries offer runtime metrics collection for each supported language, and OpenTelemetry (OTel) also collects compatible runtime metrics that can be sent to Datadog through the OpenTelemetry SDKs.

Compatibility

Datadog supports OpenTelemetry runtime metrics for the following languages:

Java
.NET
Go

For details about host and container metrics mapping, see OpenTelemetry Metrics Mapping.

Setup instructions

1. Prerequisites

You have successfully configured OpenTelemetry metrics to send to Datadog.
You have installed the corresponding language integration in Datadog.

2. Configure your application

Select your language to see instructions for configuring the OpenTelemetry SDK to send runtime metrics:

Automatic instrumentation

If you use OpenTelemetry automatic instrumentation for Java applications, runtime metrics are enabled by default.

Manual instrumentation

If you use OpenTelemetry manual instrumentation, follow the guides for your Java version:

OpenTelemetry Go applications are instrumented manually. To enable runtime metrics, see the documentation for the runtime package.

The minimum supported version of the .NET OpenTelemetry SDK is 1.5.0

Automatic instrumentation

If you use OpenTelemetry automatic instrumentation for .NET applications, runtime metrics are enabled by default.

Manual instrumentation

If you use OpenTelemetry manual instrumentation, see the documentation for the OpenTelemetry.Instrumentation.Runtime library.

Metric export interval

The default metric export interval for the .NET OTel SDK differs 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:

OTEL_METRIC_EXPORT_INTERVAL=10000

View runtime metric dashboards

After setup is complete, you can view runtime metrics in:

The service’s details page (see Java example below)
The flame graph metrics tab
Default runtime dashboards

Service page showing OpenTelemetry runtime metrics on the JVM Metrics tab

Data collected

When using OpenTelemetry runtime metrics with Datadog, you receive both:

Original OpenTelemetry runtime metrics
Mapped Datadog runtime metrics for equivalent metrics

The OpenTelemetry runtime metrics have the following prefixes based on their source:

Source	Prefix
OTel Collector Datadog Exporter	`otel.process.runtime.*`
Datadog Agent OTLP Ingest	`process.runtime.*`

The following tables list the Datadog runtime metrics that are supported through OpenTelemetry mapping. “N/A” indicates that there is no OpenTelemetry equivalent metric available.

OpenTelemetry runtime metrics are mapped to Datadog by metric name. Do not rename host metrics for OpenTelemetry runtime metrics as this breaks the mapping.

Datadog metric	Description	OpenTelemetry metric
`jvm.heap_memory`	The total Java heap memory used.	`process.runtime.jvm.memory.usage` `jvm.memory.used`
`jvm.heap_memory_committed`	The total Java heap memory committed to be used.	`process.runtime.jvm.memory.committed` `jvm.memory.committed`
`jvm.heap_memory_init`	The initial Java heap memory allocated.	`process.runtime.jvm.memory.init` `jvm.memory.init`
`jvm.heap_memory_max`	The maximum Java heap memory available.	`process.runtime.jvm.memory.limit` `jvm.memory.limit`
`jvm.non_heap_memory`	The total Java non-heap memory used. Non-heap memory is: `Metaspace + CompressedClassSpace + CodeCache`.	`process.runtime.jvm.memory.usage` `jvm.memory.used`
`jvm.non_heap_memory_committed`	The total Java non-heap memory committed to be used.	`process.runtime.jvm.memory.committed` `jvm.memory.committed`
`jvm.non_heap_memory_init`	The initial Java non-heap memory allocated.	`process.runtime.jvm.memory.init` `jvm.memory.init`
`jvm.non_heap_memory_max`	The maximum Java non-heap memory available.	`process.runtime.jvm.memory.limit` `jvm.memory.limit`
`jvm.gc.old_gen_size`	The current Java heap memory usage of the Old Generation memory pool.	`process.runtime.jvm.memory.usage` `jvm.memory.used`
`jvm.gc.eden_size`	The current Java heap memory usage of the Eden memory pool.	`process.runtime.jvm.memory.usage` `jvm.memory.used`
`jvm.gc.survivor_size`	The current Java heap memory usage of the Survivor memory pool.	`process.runtime.jvm.memory.usage` `jvm.memory.used`
`jvm.gc.metaspace_size`	The current Java non-heap memory usage of the Metaspace memory pool.	`process.runtime.jvm.memory.usage` `jvm.memory.used`
`jvm.thread_count`	The number of live threads.	`process.runtime.jvm.threads.count` `jvm.thread.count`
`jvm.loaded_classes`	Number of classes currently loaded.	`process.runtime.jvm.classes.current_loaded` `jvm.class.count`
`jvm.cpu_load.system`	Recent CPU utilization for the whole system.	`process.runtime.jvm.system.cpu.utilization` `jvm.system.cpu.utilization`
`jvm.cpu_load.process`	Recent CPU utilization for the process.	`process.runtime.jvm.cpu.utilization` `jvm.cpu.recent_utilization`
`jvm.buffer_pool.direct.used`	Measure of memory used by direct buffers.	`process.runtime.jvm.buffer.usage` `jvm.buffer.memory.usage`
`jvm.buffer_pool.direct.count`	Number of direct buffers in the pool.	`process.runtime.jvm.buffer.count` `jvm.buffer.count`
`jvm.buffer_pool.direct.limit`	Measure of total memory capacity of direct buffers.	`process.runtime.jvm.buffer.limit` `jvm.buffer.memory.limit`
`jvm.buffer_pool.mapped.used`	Measure of memory used by mapped buffers.	`process.runtime.jvm.buffer.usage` `jvm.buffer.memory.usage`
`jvm.buffer_pool.mapped.count`	Number of mapped buffers in the pool.	`process.runtime.jvm.buffer.count` `jvm.buffer.count`
`jvm.buffer_pool.mapped.limit`	Measure of total memory capacity of mapped buffers.	`process.runtime.jvm.buffer.limit` `jvm.buffer.memory.limit`
`jvm.gc.parnew.time`	The approximate accumulated garbage collection time elapsed.	N/A
`jvm.gc.cms.count`	The total number of garbage collections that have occurred.	N/A
`jvm.gc.major_collection_count`	The rate of major garbage collections. Set `new_gc_metrics: true` to receive this metric.	N/A
`jvm.gc.minor_collection_count`	The rate of minor garbage collections. Set `new_gc_metrics: true` to receive this metric.	N/A
`jvm.gc.major_collection_time`	The fraction of time spent in major garbage collection. Set `new_gc_metrics: true` to receive this metric.	N/A
`jvm.gc.minor_collection_time`	The fraction of time spent in minor garbage collection. Set `new_gc_metrics: true` to receive this metric.	N/A
`jvm.os.open_file_descriptors`	The number of open file descriptors.	N/A

Datadog metric	Description	OpenTelemetry metric
`runtime.go.num_goroutine`	Number of goroutines spawned.	`process.runtime.go.goroutines`
`runtime.go.num_cgo_call`	Number of CGO calls made.	`process.runtime.go.cgo.calls`
`runtime.go.mem_stats.lookups`	Number of pointer lookups performed by the runtime.	`process.runtime.go.mem.lookups`
`runtime.go.mem_stats.heap_alloc`	Bytes of allocated heap objects.	`process.runtime.go.mem.heap_alloc`
`runtime.go.mem_stats.heap_sys`	Bytes of heap memory obtained from the operating system.	`process.runtime.go.mem.heap_sys`
`runtime.go.mem_stats.heap_idle`	Bytes in idle (unused) spans.	`process.runtime.go.mem.heap_idle`
`runtime.go.mem_stats.heap_inuse`	Bytes in in-use spans.	`process.runtime.go.mem.heap_inuse`
`runtime.go.mem_stats.heap_released`	Bytes of physical memory returned to the operating system.	`process.runtime.go.mem.heap_released`
`runtime.go.mem_stats.heap_objects`	Number of allocated heap objects.	`process.runtime.go.mem.heap_objects`
`runtime.go.mem_stats.pause_total_ns`	Cumulative nanoseconds in garbage collection (GC).	`process.runtime.go.gc.pause_total_ns`
`runtime.go.mem_stats.num_gc`	Number of completed GC cycles.	`process.runtime.go.gc.count`
`runtime.go.num_cpu`	Number of CPUs detected by the runtime.	N/A
`runtime.go.mem_stats.alloc`	Bytes of allocated heap objects.	N/A
`runtime.go.mem_stats.total_alloc`	Cumulative bytes allocated for heap objects.	N/A
`runtime.go.mem_stats.sys`	Total bytes of memory obtained from the operating system.	N/A
`runtime.go.mem_stats.mallocs`	Cumulative count of heap objects allocated.	N/A
`runtime.go.mem_stats.frees`	Cumulative count of heap objects freed.	N/A
`runtime.go.mem_stats.stack_inuse`	Bytes in stack spans.	N/A
`runtime.go.mem_stats.stack_sys`	Bytes of stack memory obtained from the operating system.	N/A
`runtime.go.mem_stats.m_span_inuse`	Bytes of allocated mspan structures.	N/A
`runtime.go.mem_stats.m_span_sys`	Bytes of memory obtained from the operating system for mspan structures.	N/A
`runtime.go.mem_stats.m_cache_inuse`	Bytes of allocated mcache structures.	N/A
`runtime.go.mem_stats.m_cache_sys`	Bytes of memory obtained from the operating system for mcache structures.	N/A
`runtime.go.mem_stats.buck_hash_sys`	Bytes of memory in profiling bucket hash tables.	N/A
`runtime.go.mem_stats.gc_sys`	Bytes of memory in garbage collection metadata.	N/A
`runtime.go.mem_stats.other_sys`	Bytes of memory in miscellaneous off-heap.	N/A
`runtime.go.mem_stats.next_gc`	Target heap size of the next GC cycle.	N/A
`runtime.go.mem_stats.last_gc`	Last garbage collection finished, as nanoseconds since the UNIX epoch.	N/A
`runtime.go.mem_stats.num_forced_gc`	Number of GC cycles that were forced by the application calling the GC function.	N/A
`runtime.go.mem_stats.gc_cpu_fraction`	Fraction of this program’s available CPU time used by the GC since the program started.	N/A
`runtime.go.gc_stats.pause_quantiles.min`	Distribution of GC pause times: minimum values.	N/A
`runtime.go.gc_stats.pause_quantiles.25p`	Distribution of GC pause times: 25th percentile.	N/A
`runtime.go.gc_stats.pause_quantiles.50p`	Distribution of GC pause times: 50th percentile.	N/A
`runtime.go.gc_stats.pause_quantiles.75p`	Distribution of GC pause times: 75th percentile.	N/A
`runtime.go.gc_stats.pause_quantiles.max`	Distribution of GC pause times: maximum values.	N/A

Datadog metric	Description	OpenTelemetry metric
`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