Adding custom attributes with the ruby agent api tutorial

okay, let's dive into adding custom attributes using the new relic ruby agent api. this tutorial will cover the concepts, best practices, and provide detailed code examples to help you effectively instrument your ruby applications.

**understanding custom attributes**

custom attributes are key-value pairs that you can attach to new relic events (like transactions, errors, and custom events). they enrich your telemetry data with contextual information specific to your application's behavior and domain. this allows you to:

* **filter and analyze:** use custom attributes in nrql queries to slice and dice your data based on application-specific properties.
* **troubleshooting:** add relevant contextual details to error traces and transaction traces to quickly identify the root cause of issues.
* **business insights:** track key performance indicators (kpis) that matter to your business and understand how they relate to your application's health.
* **personalized dashboards:** create dashboards that visualize metrics filtered and grouped by your custom attributes.

**when to use custom attributes**

consider using custom attributes when:

* you need to track data that is not automatically collected by new relic's standard instrumentation.
* you want to add context to existing events (transactions, errors, etc.).
* you want to correlate events across different parts of your application.
* you want to analyze performance based on specific user segments, product features, or other business-relevant dimensions.

**best practices**

* **naming conventions:**
* use descriptive and consistent names.
* avoid special characters and spaces in attribute names. use underscores or camelcase instead.
* **data types:** new relic supports string, numeric (integer, float), and boolean data types fo ...

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