Code change:
The following log line is often (~30times) logged during our tests in : . This suggests a possible bug as it was assumed to do not happen. No log line saying . Look at artifacts of all (or almost all) builds of: No response <details</details<detailsReproducible in tests </details<details</details<details</details<details</details<details</details
/sig node FYI
/triage accepted since it's a new error, it is a regression. So adding a corresponding priority /priority important-soon
are you working on this? Should I assign bug to you?
Yes, I'm taking a look at this. /assign
/cc
This is a metrics only error (we don’t report a fraction of metrics) and has no functional impact.
That makes sense, but is it expected that this is a valid state in first place? . My assumption was that if static is false, (i.e. API pod) then we should have a config?
I took a closer look at the logs, it seems that this is happening when we enter while a static pod is being synced which has UID reuse and another pod which has the same full name did not terminate yet. In this case, we block the static pod from starting i.e. () returns false: Because the pod can't start, we don't set : which means that when we log metrics there is no set and thus or are both defaulted to false:
Based on the above, it looks like this case is expected. As a result, maybe the simplest option is to simply drop the log statement since by design we only want to into account a subset of the states for the metrics?

Related discussion:
text: }, }, { <ins> name:    "pod that could not start still has a pending update and is tracked in metrics", wantErr: false, pods: []*v1.Pod{ staticPod(), }, prepareWorker: func(t *testing.T, w *podWorkers, records map[types.UID][]syncPodRecord) { // send a create of a static pod pod := staticPod() // block startup of the static pod due to full name collision w.startedStaticPodsByFullname[kubecontainer.GetPodFullName(pod)] = types.UID("2") w.UpdatePod(UpdatePodOptions{ UpdateType: kubetypes.SyncPodCreate, StartTime:  time.Unix(1, 0).UTC(), Pod:        pod, }) drainAllWorkers(w) if _, ok := records[pod.UID]; ok { t.Fatalf("unexpected records: %#v", records) } // pod worker is unaware of pod1 yet }, wantWorker: func(t *testing.T, w *podWorkers, records map[types.UID][]syncPodRecord) { uid := types.UID("1") if len(w.podSyncStatuses) != 1 { t.Fatalf("unexpected sync statuses: %#v", w.podSyncStatuses) } s, ok := w.podSyncStatuses[uid] if !ok || s.IsTerminationRequested() || s.IsTerminationStarted() || s.IsFinished() || s.IsWorking() || s.IsDeleted() || s.restartRequested || s.activeUpdate != nil || s.pendingUpdate == nil { t.Errorf("unexpected requested pod termination: %#v", s) } // expect that no sync calls are made, since the pod doesn't ever start if actual, expected := records[uid], []syncPodRecord(nil); !reflect.DeepEqual(expected, actual) { t.Fatalf("unexpected pod sync records: %s", cmp.Diff(expected, actual, cmp.AllowUnexported(syncPodRecord{}))) } }, expectMetrics: map[string]string{ metrics.DesiredPodCount.FQName(): `# HELP kubelet_desired_pods [ALPHA] The number of pods the kubelet is being instructed to run. static is true if the pod is not from the apiserver. # TYPE kubelet_desired_pods gauge kubelet_desired_pods{static=""} 0 kubelet_desired_pods{static="true"} 1 `, metrics.WorkingPodCount.FQName(): `# HELP kubelet_working_pods [ALPHA] Number of pods the kubelet is actually running, broken down by lifecycle phase, whether the pod is desired, orphaned, or runtime only (also orphaned), and whether the pod is static. An orphaned pod has been removed from local configuration or force deleted in the API and consumes resources that are not otherwise visible. # TYPE kubelet_working_pods gauge kubelet_working_pods{config="desired",lifecycle="sync",static=""} 0 kubelet_working_pods{config="desired",lifecycle="sync",static="true"} 1 kubelet_working_pods{config="desired",lifecycle="terminated",static=""} 0 kubelet_working_pods{config="desired",lifecycle="terminated",static="true"} 0 kubelet_working_pods{config="desired",lifecycle="terminating",static=""} 0 kubelet_working_pods{config="desired",lifecycle="terminating",static="true"} 0 kubelet_working_pods{config="orphan",lifecycle="sync",static=""} 0 kubelet_working_pods{config="orphan",lifecycle="sync",static="true"} 0 kubelet_working_pods{config="orphan",lifecycle="terminated",static=""} 0 kubelet_working_pods{config="orphan",lifecycle="terminated",static="true"} 0 kubelet_working_pods{config="orphan",lifecycle="terminating",static=""} 0 kubelet_working_pods{config="orphan",lifecycle="terminating",static="true"} 0 kubelet_working_pods{config="runtime_only",lifecycle="sync",static="unknown"} 0 kubelet_working_pods{config="runtime_only",lifecycle="terminated",static="unknown"} 0 kubelet_working_pods{config="runtime_only",lifecycle="terminating",static="unknown"} 0 `, }, }, { </ins> name:           "pod that could not start and is not in config is force terminated without runtime during pod cleanup", wantErr:        false, terminatingErr: errors.New("unable to terminate"),