# Generating custom subsegments with the X-Ray SDK for Go
<a name="xray-sdk-go-subsegments"></a>

**Note**  
X-Ray SDK/Daemon Maintenance Notice – On February 25th, 2026, the AWS X-Ray SDKs/Daemon will enter maintenance mode, where AWS will limit X-Ray SDK and Daemon releases to address security issues only. For more information on the support timeline, see [X-Ray SDK and Daemon Support timeline](xray-sdk-daemon-timeline.md). We recommend to migrate to OpenTelemetry. For more information on migrating to OpenTelemetry, see [Migrating from X-Ray instrumentation to OpenTelemetry instrumentation ](https://docs.aws.amazon.com/xray/latest/devguide/xray-sdk-migration.html).

Subsegments extend a trace's [segment](xray-concepts.md#xray-concepts-segments) with details about work done in order to serve a request. Each time you make a call with an instrumented client, the X-Ray SDK records the information generated in a subsegment. You can create additional subsegments to group other subsegments, to measure the performance of a section of code, or to record annotations and metadata.

Use the `Capture` method to create a subsegment around a function.

**Example main.go – Custom subsegment**  

```
func criticalSection(ctx context.Context) {
  //this is an example of a subsegment
  xray.Capture(ctx, "GameModel.saveGame", func(ctx1 context.Context) error {
    var err error

    section.Lock()
    result := someLockedResource.Go()
    section.Unlock()

    xray.AddMetadata(ctx1, "ResourceResult", result)
  })
```

The following screenshot shows an example of how the `saveGame` subsegment might appear in traces for the application `Scorekeep`.

![\[Trace timeline showing Scorekeep application segments, including DynamoDB operations and GameModel saveGame subsegment.\]](http://docs.aws.amazon.com/xray/latest/devguide/images/scorekeep-PUTrules-timeline-subsegments.png)