<p>The issue started after a major update of cert-manager from 0.6.0 to 0.11.0 version.
The update has been processed via config backup, cert-manager remove, helm update, then cert-manager install and backup restore. No config changes during the update.</p>

<p>Pod and service are up, but no certs issued after update.</p>

<p>There are logs for cert-manager service:</p>

<pre><code> E0114 04:34:18.126497       1 sync.go:57] cert-manager/controller/ingress-shim "msg"="failed to determine issuer to be used for ingress resource" "error"="failed to determine issuer name to be used for ingress resource" "resource_kind"="Ingress" "resource_name"="ucb-sandbox-ingress" "resource_namespace"="cloud-engagement-sandbox" 
I0114 04:34:18.126791       1 controller.go:135] cert-manager/controller/ingress-shim "level"=0 "msg"="finished processing work item" "key"="cloud-engagement-sandbox/ucb-sandbox-ingress" 
I0114 04:34:18.127064       1 controller.go:129] cert-manager/controller/ingress-shim "level"=0 "msg"="syncing item" "key"="cloud-engagement-sandbox/ucf-sandbox-ingress" 
E0114 04:34:18.127294       1 sync.go:57] cert-manager/controller/ingress-shim "msg"="failed to determine issuer to be used for ingress resource" "error"="failed to determine issuer name to be used for ingress resource" "resource_kind"="Ingress" "resource_name"="ucf-sandbox-ingress" "resource_namespace"="cloud-engagement-sandbox" 
I0114 04:34:18.127534       1 controller.go:135] cert-manager/controller/ingress-shim "level"=0 "msg"="finished processing work item" "key"="cloud-engagement-sandbox/ucf-sandbox-ingress" 
</code></pre>

<p>My ClusterIssuer yaml:</p>

<pre><code>apiVersion: certmanager.k8s.io/v1alpha2
kind: ClusterIssuer
metadata:
  name: letsencrypt-prod
spec:
  acme:
    server: https://acme-v02.api.letsencrypt.org/directory
    email: [removed]
    privateKeySecretRef:

      name: letsencrypt-prod
    http01: {}
</code></pre>

<p>And describe ClusterIssuer letsencrypt-prod</p>

<pre><code>ClusterIssuer letsencrypt-prod
Name:         letsencrypt-prod
Namespace:
Labels:       &lt;none&gt;
Annotations:  kubectl.kubernetes.io/last-applied-configuration:
                {"apiVersion":"certmanager.k8s.io/v1alpha1","kind":"ClusterIssuer","metadata":{"annotations":{},"creationTimestamp":"2019-02-17T22:42:55Z"...
API Version:  certmanager.k8s.io/v1alpha1
Kind:         ClusterIssuer
Metadata:
  Creation Timestamp:  2019-02-17T22:42:55Z
  Generation:          1
  Resource Version:    53383155
  Self Link:           /apis/certmanager.k8s.io/v1alpha1/clusterissuers/letsencrypt-prod
  UID:                 5e0c332f-3305-11e9-93cb-069443f5754c
Spec:
  Acme:
    Email:  [removed]
    Http 01:
    Private Key Secret Ref:
      Key:
      Name:  letsencrypt-prod
    Server:  https://acme-v02.api.letsencrypt.org/directory
Status:
  Acme:
    Uri:  https://acme-v02.api.letsencrypt.org/acme/acct/51694394
  Conditions:
    Last Transition Time:  2019-02-17T22:42:57Z
    Message:               The ACME account was registered with the ACME server
    Reason:                ACMEAccountRegistered
    Status:                True
    Type:                  Ready
Events:                    &lt;none&gt;
</code></pre>

<p>The apiVersion has been changed from <code>certmanager.k8s.io/v1alpha1</code> to <code>cert-manager.io/v1alpha2</code>. But You still have CRD with old apiVersion which you need to remove. </p>

<p>Follow below steps to upgrade cert manager paying attention to 
step 3 and 4.</p>

<p>1.Back up existing cert-manager resources, as per the <a href="https://cert-manager.io/docs/tutorials/backup/" rel="noreferrer">backup and restore guide</a>.</p>

<p>2.<a href="https://cert-manager.io/docs/installation/uninstall/" rel="noreferrer">Uninstall cert-manager</a></p>

<p>3.Ensure the old cert-manager CRD resources have also been deleted: kubectl get crd | grep certmanager.k8s.io</p>

<p>4.Update the apiVersion on all your backed up resources from certmanager.k8s.io/v1alpha1 to cert-manager.io/v1alpha2.</p>

<p>5.Re-install cert-manager from scratch according to the <a href="https://cert-manager.io/docs/installation/" rel="noreferrer">installation guide</a></p>

<p>Here is the official <a href="https://cert-manager.io/docs/installation/upgrading/upgrading-0.10-0.11/" rel="noreferrer">upgrade guide</a></p>
