[receiver/awsxray] Use component.UseLocalHostAsDefaultHost feature ga…

…te (#30824)

**Description:** Fixes #30823

.chloggen/mx-psi_internal-localhostgate.yaml

@@ -23,6 +23,7 @@ subtext: |
     - receiver/awsfirehose
     - processor/remotetap
     - receiver/splunk_hec
+    - receiver/awsxray
 
 # If your change doesn't affect end users or the exported elements of any package,
 # you should instead start your pull request title with [chore] or use the "Skip Changelog" label.

receiver/awsxrayreceiver/README.md

@@ -48,6 +48,8 @@ The UDP address and port on which this receiver listens for X-Ray segment docume
 
 Default: `0.0.0.0:2000`
 
+The `component.UseLocalHostAsDefaultHost` feature gate changes this to localhost:2000. This will become the default in a future release.
+
 ### transport (Optional)
 This should always be "udp" as X-Ray SDKs only send segments using UDP.
 

receiver/awsxrayreceiver/factory.go

@@ -12,10 +12,13 @@ import (
 	"go.opentelemetry.io/collector/receiver"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/aws/proxy"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/common/localhostgate"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awsxrayreceiver/internal/metadata"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awsxrayreceiver/internal/udppoller"
 )
 
+const defaultPort = 2000
+
 // NewFactory creates a factory for AWS receiver.
 func NewFactory() receiver.Factory {
 	return receiver.NewFactory(
@@ -29,10 +32,8 @@ func createDefaultConfig() component.Config {
 	// in the X-Ray daemon:
 	// https://github.com/aws/aws-xray-daemon/blob/master/pkg/cfg/cfg.go#L99
 	return &Config{
-		// X-Ray daemon defaults to 127.0.0.1:2000 but
-		// the default in OT is 0.0.0.0.
 		NetAddr: confignet.NetAddr{
-			Endpoint:  "0.0.0.0:2000",
+			Endpoint:  localhostgate.EndpointForPort(defaultPort),
 			Transport: udppoller.Transport,
 		},
 		ProxyServer: proxy.DefaultConfig(),