[receiver/zookeeper] Use component.UseLocalHostAsDefaultHost feature …

…gate

Fixes open-telemetry#30867

.chloggen/mx-psi_internal-localhostgate.yaml

@@ -20,6 +20,7 @@ subtext: |
     - receiver/loki
     - receiver/opencensus
     - receiver/zipkin
+    - receiver/zookeeper
 
 # 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/zookeeperreceiver/README.md

@@ -19,7 +19,7 @@ to be enabled for the receiver to be able to collect metrics.
 
 ## Configuration
 
-- `endpoint`: (default = `:2181`) Endpoint to connect to collect metrics. Takes the form `host:port`.
+- `endpoint`: (default = `0.0.0.0:2181`) Endpoint to connect to collect metrics. Takes the form `host:port`. The `component.UseLocalHostAsDefaultHost` feature gate changes this to localhost:2181. This will become the default in a future release.
 - `timeout`: (default = `10s`) Timeout within which requests should be completed.
 - `initial_delay` (default = `1s`): defines how long this receiver waits before starting.
 

receiver/zookeeperreceiver/factory.go

@@ -14,9 +14,11 @@ import (
 	"go.opentelemetry.io/collector/receiver/scraperhelper"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/zookeeperreceiver/internal/metadata"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/common/localhostgate"
 )
 
 const (
+	defaultPort = 2181
 	defaultCollectionInterval = 10 * time.Second
 	defaultTimeout            = 10 * time.Second
 )
@@ -37,7 +39,7 @@ func createDefaultConfig() component.Config {
 	return &Config{
 		ScraperControllerSettings: cfg,
 		TCPAddr: confignet.TCPAddr{
-			Endpoint: ":2181",
+			Endpoint: localhostgate.EndpointForPort(defaultPort),
 		},
 		MetricsBuilderConfig: metadata.DefaultMetricsBuilderConfig(),
 	}