> For the complete documentation index, see [llms.txt](https://docs.mediarithmics.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mediarithmics.io/audience-and-activation/build-your-audiences/segment-reference/segment-capabilities.md).

# Segment capabilities

The segments list, the actions available on a segment, and the four alerts the platform raises on your segments.

## What this page is for

Once a segment exists, the platform gives you a set of capabilities on top of it: figures, dashboards, comparisons, exports, labels, and alerts. This page covers the segments list and the alerts; the individual capabilities have their own pages.

## The segments list

**Audience > Segments** is where you view and manage your segments. Click **Edit view** to choose the columns you see.

{% columns %}
{% column %}

### Default columns

* **Type.** The [segment type](/audience-and-activation/build-your-audiences/segment-reference/segment-types.md).
* **Name**
* **Creation date**
* **UserPoint.** The number of users in the segment.
  {% endcolumn %}

{% column %}

### Optional columns

* **Id**
* **Technical name**
* **User Accounts.** Users in the segment having a user account.
* **Emails.** Users in the segment having an email hash.
* **Cookies.** Users in the segment having a cookie.
  {% endcolumn %}
  {% endcolumns %}

Changes to your list view - filters, visible columns - apply only to you, and are kept for your next visit.

### Searching and filtering

Search by name or id in the search bar, or click **Filter** to filter by:

* Segment type. See [Segment types](/audience-and-activation/build-your-audiences/segment-reference/segment-types.md).
* Segment [labels](/audience-and-activation/build-your-audiences/segment-reference/segment-capabilities/labels.md).
* Whether the segment is persisted.
* Segment creation date.

Click **Export stats** to export the statistics of the segments in the current view.

## Available actions on a segment

The actions sit at the top right of the segment page.

<table data-search="false"><thead><tr><th width="230">Action</th><th>What it does</th></tr></thead><tbody><tr><td><strong>Edit</strong></td><td>Reopens the segment in whatever produced it. See <a href="/audience-and-activation/build-your-audiences/segment-reference/segment-types/query-segment.md#editing-one">Query segment</a>.</td></tr><tr><td><strong>Create Lookalike</strong></td><td>Launches the lookalike creation wizard. See <a href="/audience-and-activation/build-your-audiences/segment-reference/segment-types/cohort-lookalike-segment.md">Cohort lookalike segment</a>.</td></tr><tr><td><strong>Create Overlap Analysis</strong></td><td>Compares this segment against the segments sharing the most users with it. See <a href="/audience-and-activation/build-your-audiences/segment-reference/segment-capabilities/overlap.md">Overlap</a>.</td></tr><tr><td><strong>New feed</strong></td><td>Sends the segment to a partner platform. See <a href="/audience-and-activation/activate-your-audiences/send-your-audience-to-a-destination/send-your-first-party-data-to-a-destination.md">Send your first-party data to a destination</a>.</td></tr><tr><td><strong>Export</strong></td><td>Exports the identifiers attached to the segment. See <a href="/audience-and-activation/build-your-audiences/segment-reference/segment-capabilities/export-segment-identifiers.md">Export segment identifiers</a>.</td></tr><tr><td><strong>Label</strong></td><td>Assigns a label to the segment. See <a href="/audience-and-activation/build-your-audiences/segment-reference/segment-capabilities/labels.md">Labels</a>.</td></tr><tr><td><strong>Create Experiment</strong></td><td>Splits the segment into test and control groups. See <a href="/audience-and-activation/build-your-audiences/segment-reference/segment-types/experiment-groups-segment.md">Experiment groups segment</a>.</td></tr></tbody></table>

The panels on the segment page itself - overview, metrics, comparison, feed card list, import status - are covered by [Segment metrics](/audience-and-activation/build-your-audiences/segment-reference/segment-capabilities/segment-metrics.md), [Segment dashboard](/audience-and-activation/build-your-audiences/segment-reference/segment-capabilities/segment-dashboard.md), [Compare segments](/audience-and-activation/analyze-your-data/compare-segments.md), [Send your first-party data to a destination](/audience-and-activation/activate-your-audiences/send-your-audience-to-a-destination/send-your-first-party-data-to-a-destination.md) and [File import segment](/audience-and-activation/build-your-audiences/segment-reference/segment-types/list-import-segment.md) respectively.

## Alerts

Alerts show you the segments that need your attention.

{% hint style="info" %}
If you do not fix an issue and close its alert, the platform increments a counter on that alert rather than raising a new one. That keeps a repeating problem from flooding you with duplicates.
{% endhint %}

### Segments that have a definition error

Usually the result of a schema change that left some segment queries incompatible. Fix those segments so they are usable, or delete them if you no longer need them.

{% hint style="info" %}
A single broken segment triggers repeated alerts, because the platform re-checks regularly whether the query has been fixed.
{% endhint %}

### Segments that had a volume drop

An alert is triggered each time a segment's volume drops by more than a threshold percentage; the current threshold is displayed in the interface. A volume drop may point at a problem in your channels, your ingestion pipeline, or your query.

Some segments are volatile by design. To stop those from alerting, use labels:

* **Blacklist** some segment [labels](/audience-and-activation/build-your-audiences/segment-reference/segment-capabilities/labels.md) - only segments carrying none of the selected labels trigger volume drop alerts.
* **Whitelist** some labels - only segments carrying one of the selected labels trigger them.

### Segments that were not correctly activated

Initial loading errors come in four flavours:

| Error                                                   | Configurable?  |
| ------------------------------------------------------- | -------------- |
| The initial loading job did not end well                | -              |
| Too many records were not correctly synchronised        | Yes, threshold |
| Initial loading did not start in the expected timeframe | Yes, timeframe |
| Initial loading is taking longer than expected          | Yes, timeframe |

Thresholds and timeframes can be updated through the alerting API, or by your Account manager. The alert objects and their configuration are documented in the **Setup & Monitor** section, under *Set up alerts*.

### Segments that could not be computed

A technical or internal issue prevented computation. These segments are recalculated automatically in the following hours, and the alert closes on its own if the next attempt succeeds.

### Closing alerts

After checking or fixing a segment, close its alert so it disappears from **Navigator** for everyone in your organisation. Two ways:

* Select several alerts in the alerts list and click **Close selected alerts**.
* Close them one at a time, from the **Close alert** button on the segment's page or from the menu in the alerts list.

## Related pages

<table data-view="cards" data-search="false"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Monitor your audiences</strong></td><td>Watching your segment estate and your feeds day to day.</td><td><a href="/audience-and-activation/activate-your-audiences/monitor-your-audiences.md">Monitor your audiences</a></td></tr><tr><td><strong>Check your audience reach and stats</strong></td><td>Reading a segment's figures, and getting an exact count.</td><td><a href="/audience-and-activation/analyze-your-data/check-your-audience-reach-and-stats.md">Check your audience reach and stats</a></td></tr></tbody></table>


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