# Flag events

### Definition

Flag events in Reflag are generated automatically in some cases and sent by the client in others. Reflag uses these events to track [flag access](/product-handbook/concepts/feature.md#access) and collect data that helps debug rule and context issues.

### Access evaluated

This event is generated automatically on the Reflag side when the client uses server-side flag evaluation, for example with [@reflag/browser-sdk](/supported-languages/browser-sdk.md) or [@reflag/react-sdk](/supported-languages/browser-sdk.md). It is generated on the client side when local evaluation is used, for example with local mode in [@reflag/node-sdk](/supported-languages/node-sdk.md).

This event contains the following information:

* The **actual context** that was used to evaluate the flag access,
* Some details of the **flag** whose access rules were evaluated,
* The **result** of the access evaluation, including **missing fields** that were expected in the [targeting rules](/product-handbook/concepts/targeting-rules.md).

### Access checked

This event is generated by all Reflag SDKs whenever client code checks whether a flag is enabled for a given context.

This event contains the following information:

* The **actual context** that was used to evaluate the flag access,
* Some details of the **flag**,
* The **result** of the access check.

{% hint style="info" %}
Reflag SDKs rate-limit these events to avoid unnecessary traffic. Unknown flag evaluations and checks are still sent to Reflag to help with debugging.
{% endhint %}

### Next steps

* Learn about [targeting rules](/product-handbook/concepts/targeting-rules.md),
* Learn how to [set up flag access rules](/product-handbook/feature-rollouts/feature-targeting-rules.md) within Reflag UI.


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