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Dynamic Instrumentation is a feature of the Datadog tracing library that lets you add instrumentation to your application at runtime without code changes or redeployments. Follow these instructions to set up Dynamic Instrumentation for .NET.

Prerequisites

Before you begin, review the Dynamic Instrumentation prerequisites. .NET applications also require:

Installation

  1. If you don’t already have APM enabled, in your Agent configuration, set the DD_APM_ENABLED environment variable to true and listening to the port 8126/TCP.
  2. Run your service with Dynamic Instrumentation enabled by setting the DD_DYNAMIC_INSTRUMENTATION_ENABLED environment variable to true. Specify DD_SERVICE, DD_ENV, and DD_VERSION Unified Service Tags so you can filter and group your instrumentations and target active clients across these dimensions.
  3. After starting your service with Dynamic Instrumentation enabled, you can start using Dynamic Instrumentation on the APM > Dynamic Instrumentation page.

Configuration

Configure Dynamic Instrumentation using the following environment variables:

Environment variableTypeDescription
DD_DYNAMIC_INSTRUMENTATION_ENABLEDBooleanSet to true to enable Dynamic Instrumentation.
DD_SERVICEStringThe service name, for example, web-backend.
DD_ENVStringThe environment name, for example, production.
DD_VERSIONStringThe version of your service.
DD_TAGSStringTags to apply to produced data. Must be a list of <key>:<value> separated by commas such as: layer:api,team:intake.

What to do next

See Dynamic Instrumentation for information about adding instrumentations and browsing and indexing the data.

Further reading

Additional helpful documentation, links, and articles: