> For the complete documentation index, see [llms.txt](https://awsnotes.dendron.so/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://awsnotes.dendron.so/networking-and-content-delivery/aws-app-mesh/topics/observability.md).

# Observability

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This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/aws-app-mesh-user-guide.git)
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## Logging

* **Important**\
  Make sure to check that your input pattern is valid for Envoy, or Envoy will reject the update and store the latest changes in the `error state`.

## Tracing

* **Important**\
  To fully implement tracing, you'll need to update your application.\
  To see all the available data from your chosen service, you'll have to instrument your application using the applicable libraries.