# Data Health Overview Page

The **Dataset Health Overview** page provides insights into a dataset's status and attributes during a specific scan.

<figure><img src="/files/3rX8ERckEwHJEXnPPj6Z" alt=""><figcaption></figcaption></figure>

On this page, you can see the Health KPIs defined in [Calculated Health Metrics](/telmai/profiling-data/data-health-metrics.md). You can also see attribute-level metrics:

| KPI           | Description                                                                     |
| ------------- | ------------------------------------------------------------------------------- |
| *Duplicates*  | Number of records with duplicate values in the attribute                        |
| *Unique*      | Number of records with unique values in the attribute                           |
| *Distinct*    | Count of distinct values in the attribute                                       |
| *Empty*       | Count of empty values, including nulls or empty strings, in the attribute       |
| *Cardinality* | The cardinality of values in the attribute, indicating whether it's low or high |

Note: For all attribute-level metrics, table-level metrics are calculated as the average across different columns.

**Selector Component**

The **Selector Component** allows you to customize the data view by selecting:

* **Dataset**: Choose the dataset you want to analyze
* **Attributes**: Select the attributes to calculate metrics on
* **Segments**: Filter the data based on specific segments
* **Scan Time**: Select the time of the data scan

<figure><img src="/files/0hdB6Z1bSIpukFBJeX6M" alt=""><figcaption></figcaption></figure>

**Health KPIs Summary**

The **Health KPIs Summary** provides a quick overview of key Data Quality KPIs at both the table and attribute levels.

<figure><img src="/files/zuZNqaOQwlAQr9WzRg6h" alt=""><figcaption></figcaption></figure>

**Attribute(s) KPIs**

For each attribute (or column), Telmai calculates and displays the corresponding profiling metrics.

<figure><img src="/files/8VaDdPPoog2n50vtLN3e" alt=""><figcaption></figcaption></figure>


---

# 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.telm.ai/telmai/profiling-data/data-health-overview-page.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.