Add comment & fix lint

exporters/otlp/otlpmetric/otlpmetrichttp/config.go

@@ -150,6 +150,15 @@ func WithHeaders(headers map[string]string) Option {
 }
 
 // WithHostHeader overrides Host header in HTTP requests.
+//
+// The example of the use case is using load balancer like envoy between
+// the otel instrumentation library and collector. Typically
+// the call via envoy's route is based on the host header. Example of the usage
+//
+// config.WithEndpoint("myenvoyhost")
+//
+//	.WithHostHeader("mytargetotelcollectorhost")
+//
 // If unset, the target Endpoint's host will be used as Host header.
 func WithHostHeader(host string) Option {
 	return wrappedOption{oconf.WithHostHeader(host)}

exporters/otlp/otlpmetric/otlpmetrichttp/internal/otest/collector.go

@@ -15,7 +15,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package otest
+package otest // import "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/otest"
 
 import (
 	"bytes"

exporters/otlp/otlptrace/otlptracehttp/internal/otlpconfig/options.go

@@ -15,7 +15,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package otlpconfig
+package otlpconfig // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp/internal/otlpconfig"
 
 import (
 	"crypto/tls"