August 12, 2025 - OpenTelemetry .NET Metrics provides a way to collect measurements about the execution of a computer program at runtime.

November 29, 2023 - In this two-part series, I’m going to show you how to use OpenTelemetry to generate custom metrics and how to visualize those metrics using Prometheus and Grafana. In part 2, I’ll demonstrate how to add OpenTelemetry Metrics to a real life .NET 8 app and how to visualize those metrics using ...

The SDK aggregates metrics using certain algorithms and memory management strategies to achieve good performance and efficiency. Here are the rules which OpenTelemetry .NET follows while implementing the metrics aggregation logic:

Welcome to the OpenTelemetry .NET documentation. This section introduces how to use OpenTelemetry with .NET to generate and collect telemetry data such as metrics, logs, and traces using the OpenTelemetry API and SDKs.

August 12, 2025 - Learn how to use OpenTelemetry Metrics in an ASP.NET Core application

Explicitly in code, by referencing and using a library such as OpenTelemetry. If you have access to the source code and can rebuild the app, then this is the most powerful and configurable mechanism. Out-of-process using EventPipe. Tools such as dotnet-monitor can listen to logs and metrics and ...

The .NET metric APIs record measurements from the example app. The OpenTelemetry library running in the app aggregates the measurements.

October 16, 2024 - The OpenTelemetry project provides a set of client libraries for .NET that allows us to collect metrics on measurements such as HTTP requests/responses, and memory allocation. To start, let’s create a new ASP.NET Core Web API, using the Visual ...

January 14, 2026 - As of 1.10.0 once a metric has reached the cardinality limit, any new measurement that could not be independently aggregated will be automatically aggregated using the overflow attribute. ... In SDK versions 1.6.0 - 1.9.0 the overflow attribute was an experimental feature that could be enabled by setting the environment variable OTEL_DOTNET_EXPERIMENTAL_METRICS_EMIT_OVERFLOW_ATTRIBUTE=true.

The .NET OpenTelemetry implementation. ... Packages shipped from this repository generally support all the officially supported versions of .NET and .NET Framework (an older Windows-based .NET implementation), except .NET Framework 3.5. Any exceptions to this are noted in the individual README.md files. Stable across all 3 signals (Logs, Metrics, and Traces).

As shown in the getting-startedgetting started in 5 minutes - Console Application doc, a valid MeterProvider must be configured and built to collect metrics with OpenTelemetry .NET Sdk. MeterProvider holds all the configuration for metrics like MetricReaders, Views, etc.

March 27, 2026 - Learn how to use OpenTelemetry Metrics in a .NET Console application

January 14, 2026 - Custom traces and metrics using .NET automatic instrumentation.

November 15, 2021 - Learn how to instrument .NET applications with OpenTelemetry for distributed tracing, metrics, and logging using open-source backends.

The program uses the OpenTelemetry.Instrumentation.AspNetCore package to automatically create metrics for incoming ASP.NET Core requests, uses the OpenTelemetry.Exporter.Console package to write metrics to the console every 1000 milliseconds.

August 12, 2025 - This guide explains the different types of metric instruments available in OpenTelemetry .NET and how to use them effectively.

Status: Stable This article defines semantic conventions for ASP.NET Core metrics. Server Routing All routing metrics are reported by the Microsoft.AspNetCore.Routing meter. Metric: aspnetcore.routing.match_attempts Name Instrument Type Unit (UCUM) Description Stability Entity Associations aspnetcore.routing.match_attempts Counter {match_attempt} Number of requests that were attempted to be matched to an endpoint.

For more details about explicit bucket Histograms in OpenTelemetry see: ... Its possible to test any custom metrics you add using MetricCollector<T>. This type makes it easy to record the measurements from specific instruments and assert the values were correct.

January 27, 2025 - dotnet add package OpenTelemetry.Instrumentation.Http ... Metrics: Collects performance-related statistics (e.g., request durations, memory usage).

3 weeks ago - The OpenTelemetry .NET Automatic Instrumentation supports a wide variety of libraries. All instrumentations are enabled by default for all signal types (traces, metrics, and logs). You can disable all instrumentations for a specific signal type by setting the OTEL_DOTNET_AUTO_{SIGNAL}_INST...