> ## Documentation Index
> Fetch the complete documentation index at: https://artie.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom monitors

> Create pipeline and table monitors for volume, ingestion lag, and PostgreSQL replication-slot size.

Custom monitors help you alert on a pipeline or a specific table before a data problem becomes a downstream incident. Open **Monitors** in the Artie Dashboard, or open a pipeline and use its **Monitors** section to add a monitor for that pipeline.

## Create a monitor

<Steps>
  <Step title="Choose a pipeline and monitor type">
    Select the pipeline to monitor, then choose the condition you want Artie to evaluate.
  </Step>

  <Step title="Optionally limit the monitor to a table">
    Low data volume, high data volume, and high ingestion lag monitors can apply to the whole pipeline or one table. Replication-slot monitors apply to a PostgreSQL pipeline.
  </Step>

  <Step title="Preview the condition and configure alerts">
    Use the chart preview to check the selected condition against recent data. Set the detection method, threshold or anomaly settings, and recipients for alerts.
  </Step>

  <Step title="Save and review the monitor">
    Artie starts evaluating the saved monitor. Its detail page shows alert history and chart data for a selected time window.
  </Step>
</Steps>

## Monitor types

| Monitor                    | What it evaluates                                              | Scope               |
| -------------------------- | -------------------------------------------------------------- | ------------------- |
| **Low data volume**        | Fewer processed rows than expected                             | Pipeline or table   |
| **High data volume**       | More processed rows than expected                              | Pipeline or table   |
| **High ingestion lag**     | Ingestion lag above the configured threshold or expected range | Pipeline or table   |
| **Large replication slot** | PostgreSQL replication slot size                               | PostgreSQL pipeline |

For low and high data volume monitors, a threshold uses a configurable row-count rollup window. A replication-slot threshold can alert immediately or after the configured size has remained exceeded for a selected duration.

## Detection and notifications

For low data volume, high data volume, and high ingestion lag, choose either:

* **Threshold** to alert when the configured value is crossed.
* **Anomaly detection** to alert when the metric departs from its expected range.

Choose whether alerts go to everyone, no one, or specific users. You can also include or exclude your company's additional alert email recipients.

<Accordion title="Default low-data monitor">
  When Artie creates a pipeline, it creates a low data volume monitor if the pipeline does not already have one. The default alerts when the pipeline has no data for 12 hours. You can edit its threshold or delete it if that alert does not fit the pipeline.
</Accordion>

## Monitor history

Open a monitor to review its alert history alongside chart data. Use this view to validate whether a threshold or anomaly setting reflects normal pipeline behavior before changing the monitor.

<Note>
  The Analytics Portal and custom monitors are related but separate. Analytics lets you explore pipeline metrics with filters. A custom monitor evaluates the condition configured on that monitor and sends alerts to its configured recipients.
</Note>