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Node.js Core

Node.js contains several internal modules designed to enable asynchronous I/O capable APIs for your application. AppSignal provides automatic instrumentation for many of these modules.

http instrumentation

AppSignal for Node.js will auto-instrument any incoming HTTP calls. When you create a new Span, it will be a child of the Span created by the core HTTP integration.

https instrumentation

Appsignal for Node.js will also auto-instrument any incoming HTTPS calls. When you create a new Span, it will be a child of the Span created by the core HTTPS integration, if the https module was used.

Heap statistics minutely probe

By default, Appsignal for Node.js will register a minutely probe that keeps track of the V8 engine's heap statistics. Once we detect these metrics we'll add a magic dashboard to your app.

The metrics reported by this method correspond to those reported by the v8.getHeapStatistics method in the Node.js standard library. For more details on how to interpret these metrics, see the official Node.js documentation on the v8 module. The probe will report the following metrics grouped by hostname tag:

  • nodejs_total_heap_size - gauge
  • nodejs_total_heap_size_executable - gauge
  • nodejs_total_physical_size - gauge
  • nodejs_used_heap_size - gauge
  • nodejs_malloced_memory - gauge
  • nodejs_number_of_native_contexts - gauge
  • nodejs_number_of_detached_contexts - gauge

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