Code-level metrics are span attributes that the Node.js agent attaches to your application's spans, pinpointing the exact function and file responsible for a given span. This allows you to be more proactive about addressing performance issues as you review your code. You can view these attributes on individual spans in distributed tracing, or query them directly with NRQL.
重要
Code-level metrics are available for Node.js agent version 9.7.5 or higher, and enabled by default for version 10.5.0 and higher. To change this configuration, check out our documentation.
Agent attributes
The Node.js agent reports and attaches the following attributes to most spans produced by web frameworks in your application.
重要
In some cases, the agent will directly wrap base framework code that's invoked within your application, and these attributes won't be attached.
Name | Description | Example |
|---|---|---|
| The name of the instrumented function. It will be | routeHandler |
| The absolute path to the source code file where | /usr/local/app/sample-node-app/index.js |
| The line number where | 639 |
| The column number where | 47 |