deployment status inconsistency

deployment.yaml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  annotations:
    deployment.kubernetes.io/revision: "1"
  creationTimestamp: "2019-08-21T16:04:57Z"
  generation: 13329
  labels:
    component: blackbox-exporter
    garden.sapcloud.io/role: system-component
    origin: gardener
    shoot.gardener.cloud/no-cleanup: "true"
  name: blackbox-exporter
  namespace: kube-system
  resourceVersion: "5339205"
  selfLink: /apis/extensions/v1beta1/namespaces/kube-system/deployments/blackbox-exporter
  uid: 787fcb69-995e-46fc-803c-f24efa2fd1cc
spec:
  progressDeadlineSeconds: 600
  replicas: 1
  revisionHistoryLimit: 0
  selector:
    matchLabels:
      component: blackbox-exporter
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      annotations:
        checksum/configmap-blackbox-exporter-config: 837ab259c403ac736c591b304338d575f29e6d82794e00685e39de9b867ddae9
      creationTimestamp: null
      labels:
        component: blackbox-exporter
        garden.sapcloud.io/role: system-component
        origin: gardener
        shoot.gardener.cloud/no-cleanup: "true"
    spec:
      containers:
      - args:
        - --config.file=/etc/blackbox_exporter/blackbox.yaml
        image: quay.io/prometheus/blackbox-exporter:v0.13.0
        imagePullPolicy: IfNotPresent
        name: blackbox-exporter
        ports:
        - containerPort: 9115
          name: probe
          protocol: TCP
        resources:
          limits:
            cpu: 10m
            memory: 35Mi
          requests:
            cpu: 5m
            memory: 5Mi
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        volumeMounts:
        - mountPath: /etc/blackbox_exporter
          name: blackbox-exporter-config
      dnsConfig:
        options:
        - name: ndots
          value: "3"
      dnsPolicy: ClusterFirst
      priorityClassName: system-cluster-critical
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext:
        fsGroup: 65534
        runAsUser: 65534
      terminationGracePeriodSeconds: 30
      tolerations:
      - effect: NoSchedule
        operator: Exists
      - key: CriticalAddonsOnly
        operator: Exists
      - effect: NoExecute
        operator: Exists
      volumes:
      - configMap:
          defaultMode: 420
          name: blackbox-exporter-config
        name: blackbox-exporter-config
status:
  conditions:
  - lastTransitionTime: "2019-08-21T16:05:11Z"
    lastUpdateTime: "2019-08-21T16:11:50Z"
    message: ReplicaSet "blackbox-exporter-6c4588cfc5" has successfully progressed.
    reason: NewReplicaSetAvailable
    status: "True"
    type: Progressing
  - lastTransitionTime: "2019-08-31T23:29:32Z"
    lastUpdateTime: "2019-08-31T23:29:32Z"
    message: Deployment does not have minimum availability.
    reason: MinimumReplicasUnavailable
    status: "False"
    type: Available
  observedGeneration: 13329
  replicas: 1
  unavailableReplicas: 1
  updatedReplicas: 1

pod.yaml

apiVersion: v1
kind: Pod
metadata:
  annotations:
    checksum/configmap-blackbox-exporter-config: 837ab259c403ac736c591b304338d575f29e6d82794e00685e39de9b867ddae9
    cni.projectcalico.org/podIP: 100.93.0.7/32
    kubernetes.io/psp: gardener.privileged
  creationTimestamp: "2019-08-21T16:05:11Z"
  generateName: blackbox-exporter-6c4588cfc5-
  labels:
    component: blackbox-exporter
    garden.sapcloud.io/role: system-component
    origin: gardener
    pod-template-hash: 6c4588cfc5
    shoot.gardener.cloud/no-cleanup: "true"
  name: blackbox-exporter-6c4588cfc5-lzh2t
  namespace: kube-system
  ownerReferences:
  - apiVersion: apps/v1
    blockOwnerDeletion: true
    controller: true
    kind: ReplicaSet
    name: blackbox-exporter-6c4588cfc5
    uid: c99112cd-28ee-4ade-872e-daa7f79fd9a5
  resourceVersion: "5339196"
  selfLink: /api/v1/namespaces/kube-system/pods/blackbox-exporter-6c4588cfc5-lzh2t
  uid: 3a1e49e6-3e21-412c-aefc-280f987429ff
spec:
  containers:
  - args:
    - --config.file=/etc/blackbox_exporter/blackbox.yaml
    image: quay.io/prometheus/blackbox-exporter:v0.13.0
    imagePullPolicy: IfNotPresent
    name: blackbox-exporter
    ports:
    - containerPort: 9115
      name: probe
      protocol: TCP
    resources:
      limits:
        cpu: 10m
        memory: 35Mi
      requests:
        cpu: 5m
        memory: 5Mi
    terminationMessagePath: /dev/termination-log
    terminationMessagePolicy: File
    volumeMounts:
    - mountPath: /etc/blackbox_exporter
      name: blackbox-exporter-config
    - mountPath: /var/run/secrets/kubernetes.io/serviceaccount
      name: default-token-pxr4n
      readOnly: true
  dnsConfig:
    options:
    - name: ndots
      value: "3"
  dnsPolicy: ClusterFirst
  enableServiceLinks: true
  nodeName: shoot--garden--region1-01-dev-cpu-worker-z1-789b4c7694-nbcdh
  priority: 2000000000
  priorityClassName: system-cluster-critical
  restartPolicy: Always
  schedulerName: default-scheduler
  securityContext:
    fsGroup: 65534
    runAsUser: 65534
  serviceAccount: default
  serviceAccountName: default
  terminationGracePeriodSeconds: 30
  tolerations:
  - effect: NoSchedule
    operator: Exists
  - key: CriticalAddonsOnly
    operator: Exists
  - effect: NoExecute
    operator: Exists
  volumes:
  - configMap:
      defaultMode: 420
      name: blackbox-exporter-config
    name: blackbox-exporter-config
  - name: default-token-pxr4n
    secret:
      defaultMode: 420
      secretName: default-token-pxr4n
status:
  conditions:
  - lastProbeTime: null
    lastTransitionTime: "2019-08-21T16:09:30Z"
    status: "True"
    type: Initialized
  - lastProbeTime: null
    lastTransitionTime: "2019-08-31T23:29:32Z"
    status: "False"
    type: Ready
  - lastProbeTime: null
    lastTransitionTime: "2019-08-21T16:11:50Z"
    status: "True"
    type: ContainersReady
  - lastProbeTime: null
    lastTransitionTime: "2019-08-21T16:09:30Z"
    status: "True"
    type: PodScheduled
  containerStatuses:
  - containerID: docker://25cc8d8252b17ba8d2e31764fdd815fe5ca336f238b811826896baa047f7c00f
    image: quay.io/prometheus/blackbox-exporter:v0.13.0
    imageID: docker-pullable://quay.io/prometheus/blackbox-exporter@sha256:0958c966dca13db9880a55e03221f507a2cf72ccf401b34642bdb0ba739d056f
    lastState: {}
    name: blackbox-exporter
    ready: true
    restartCount: 0
    state:
      running:
        startedAt: "2019-08-21T16:11:49Z"
  hostIP: 198.18.2.27
  phase: Running
  podIP: 100.93.0.7
  qosClass: Burstable
  startTime: "2019-08-21T16:09:30Z"

replicaset.sh

$ kubectl -n kube-system get rs blackbox-exporter-6c4588cfc5 
NAME                           DESIRED   CURRENT   READY   AGE
blackbox-exporter-6c4588cfc5   1         1         0       20d
$ kubectl -n kube-system get rs blackbox-exporter-6c4588cfc5 -o yaml
apiVersion: extensions/v1beta1
kind: ReplicaSet
metadata:
  annotations:
    deployment.kubernetes.io/desired-replicas: "1"
    deployment.kubernetes.io/max-replicas: "2"
    deployment.kubernetes.io/revision: "1"
  creationTimestamp: "2019-08-21T16:05:11Z"
  generation: 1
  labels:
    component: blackbox-exporter
    garden.sapcloud.io/role: system-component
    origin: gardener
    pod-template-hash: 6c4588cfc5
    shoot.gardener.cloud/no-cleanup: "true"
  name: blackbox-exporter-6c4588cfc5
  namespace: kube-system
  ownerReferences:
  - apiVersion: apps/v1
    blockOwnerDeletion: true
    controller: true
    kind: Deployment
    name: blackbox-exporter
    uid: 787fcb69-995e-46fc-803c-f24efa2fd1cc
  resourceVersion: "5339200"
  selfLink: /apis/extensions/v1beta1/namespaces/kube-system/replicasets/blackbox-exporter-6c4588cfc5
  uid: c99112cd-28ee-4ade-872e-daa7f79fd9a5
spec:
  replicas: 1
  selector:
    matchLabels:
      component: blackbox-exporter
      pod-template-hash: 6c4588cfc5
  template:
    metadata:
      annotations:
        checksum/configmap-blackbox-exporter-config: 837ab259c403ac736c591b304338d575f29e6d82794e00685e39de9b867ddae9
      creationTimestamp: null
      labels:
        component: blackbox-exporter
        garden.sapcloud.io/role: system-component
        origin: gardener
        pod-template-hash: 6c4588cfc5
        shoot.gardener.cloud/no-cleanup: "true"
    spec:
      containers:
      - args:
        - --config.file=/etc/blackbox_exporter/blackbox.yaml
        image: quay.io/prometheus/blackbox-exporter:v0.13.0
        imagePullPolicy: IfNotPresent
        name: blackbox-exporter
        ports:
        - containerPort: 9115
          name: probe
          protocol: TCP
        resources:
          limits:
            cpu: 10m
            memory: 35Mi
          requests:
            cpu: 5m
            memory: 5Mi
        terminationMessagePath: /dev/termination-log
        terminationMessagePolicy: File
        volumeMounts:
        - mountPath: /etc/blackbox_exporter
          name: blackbox-exporter-config
      dnsConfig:
        options:
        - name: ndots
          value: "3"
      dnsPolicy: ClusterFirst
      priorityClassName: system-cluster-critical
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext:
        fsGroup: 65534
        runAsUser: 65534
      terminationGracePeriodSeconds: 30
      tolerations:
      - effect: NoSchedule
        operator: Exists
      - key: CriticalAddonsOnly
        operator: Exists
      - effect: NoExecute
        operator: Exists
      volumes:
      - configMap:
          defaultMode: 420
          name: blackbox-exporter-config
        name: blackbox-exporter-config
status:
  fullyLabeledReplicas: 1
  observedGeneration: 1
  replicas: 1