fix some typos

pkg/kubelet/runtime.go

@@ -17,9 +17,12 @@ limitations under the License.
 package kubelet
 
 import (
+	"errors"
 	"fmt"
 	"sync"
 	"time"
+
+	utilerrors "k8s.io/apimachinery/pkg/util/errors"
 )
 
 type runtimeState struct {
@@ -70,32 +73,32 @@ func (s *runtimeState) podCIDR() string {
 	return s.cidr
 }
 
-func (s *runtimeState) runtimeErrors() []string {
+func (s *runtimeState) runtimeErrors() error {
 	s.RLock()
 	defer s.RUnlock()
-	var ret []string
+	errs := []error{}
 	if s.lastBaseRuntimeSync.IsZero() {
-		ret = append(ret, "container runtime status check may not have completed yet")
+		errs = append(errs, errors.New("container runtime status check may not have completed yet."))
 	} else if !s.lastBaseRuntimeSync.Add(s.baseRuntimeSyncThreshold).After(time.Now()) {
-		ret = append(ret, "container runtime is down")
+		errs = append(errs, errors.New("container runtime is down."))
 	}
 	for _, hc := range s.healthChecks {
 		if ok, err := hc.fn(); !ok {
-			ret = append(ret, fmt.Sprintf("%s is not healthy: %v", hc.name, err))
+			errs = append(errs, fmt.Errorf("%s is not healthy: %v.", hc.name, err))
 		}
 	}
 
-	return ret
+	return utilerrors.NewAggregate(errs)
 }
 
-func (s *runtimeState) networkErrors() []string {
+func (s *runtimeState) networkErrors() error {
 	s.RLock()
 	defer s.RUnlock()
-	var ret []string
+	errs := []error{}
 	if s.networkError != nil {
-		ret = append(ret, s.networkError.Error())
+		errs = append(errs, s.networkError)
 	}
-	return ret
+	return utilerrors.NewAggregate(errs)
 }
 
 func newRuntimeState(
@@ -104,6 +107,6 @@ func newRuntimeState(
 	return &runtimeState{
 		lastBaseRuntimeSync:      time.Time{},
 		baseRuntimeSyncThreshold: runtimeSyncThreshold,
-		networkError:             fmt.Errorf("network state unknown"),
+		networkError:             ErrNetworkUnknown,
 	}
 }