> For the complete documentation index, see [llms.txt](https://docs.opsnow.io/dev-opsnow-user-guide-v0.2/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.opsnow.io/dev-opsnow-user-guide-v0.2/menu/anomalies/history-tab.md).

# 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:

   tab.&#x20;

   * **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.