# History Tab

You can check cost anomaly detection history and notification history.

<figure><img src="/files/63P9FbTnoxKV6vVVvG8q" alt=""><figcaption></figcaption></figure>

1. **Select Period:** Click the date field, then choose a preset range on the left, or select custom start and end dates on the calendar. Next, click **OK** to apply or **Cancel** to exit.
2. **Search Bar:** To find specific information, type a keyword in the search bar.
3. **Table:** Displays the detailed history of cost anomaly detection. Each column provides the following details:

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   * **Cloud:** Indicates the cloud service provider (AWS, Azure, GCP).
   * **Type:** Shows how the rule was created (Manual or AI).
   * **Name:** The rule name set by the user.
   * **Analyzed by:** Indicates the scope used for analysis
   * **Period:** The comparison period used for anomaly detection.
   * **Threshold:** The minimum cost difference that triggers a detection alert.
   * **Cost Change:** Displays the detected cost increase or decrease amount.
   * **Sent Email:** Lists the recipients who received the alert notification.
   * **Sent Date:** The date and time the email notification was sent.
   * **Detection Date:** The date the anomaly was detected.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.opsnow.io/opsnow-user-guide-v0.2/menu/anomalies/history-tab.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.