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

# Log events

> Grouped log patterns used in issue evidence

A log event is a grouped pattern of matching log records. Tero uses log events to show service, severity, volume, cost, policies, and related issues for recurring telemetry.

{/* screenshot-generated id: log-events-catalog */}

<Frame>
  <img src="https://mintcdn.com/tero-0926be64/7xmYF6M7rw0_8Xl4/images/screenshots/master-catalog/log-events-catalog.png?fit=max&auto=format&n=7xmYF6M7rw0_8Xl4&q=85&s=806aca35878dd8aca6dda63974ecc73c" alt="Log events group raw logs into patterns you can review." width="1440" height="1000" data-path="images/screenshots/master-catalog/log-events-catalog.png" />
</Frame>

<p className="screenshot-caption"><small>Log events group raw logs into patterns you can review. <a className="demo-screenshot-link" href="https://demo.usetero.com/log-events" target="_blank" rel="noopener noreferrer">Open in demo <Icon icon="arrow-up-right-from-square" /></a></small></p>

## Log event list

The Log events list can show these fields:

| Field      | Description                                         |
| ---------- | --------------------------------------------------- |
| Log event  | The grouped log pattern name or description.        |
| Service    | Service that emits the event.                       |
| Severity   | Observed severity for matching logs.                |
| Event rate | How often matching logs arrive.                     |
| Volume     | Total observed log volume over the selected window. |
| Cost       | Estimated annualized cost for the event.            |
| Updated    | Most recent update time.                            |

Datadog-scoped accounts can inspect 24-hour, 7-day, and 30-day log-volume windows.

## Log event detail

Log event detail pages show the event in context. Current detail tabs include overview, policies, and issues.

| Detail area | Description                               |
| ----------- | ----------------------------------------- |
| Overview    | Service, volume, cost, and event summary. |
| Policies    | Policies attached to the event.           |
| Issues      | Issues related to the event.              |

## Relationship to issues

Issues use log events as evidence when a finding concerns a recurring log pattern. A cost issue may point to a high-volume event, while a compliance issue may point to an event that carries sensitive fields. A policy recommendation may match a specific log event so the runtime can drop, sample, redact, or transform it.

## Related pages

* [Evidence](/issues/evidence)
* [Services](/master-catalog/services)
* [Policies](/policies)