In the upcoming lecture, the Issuer manifest will need a few small changes per these docs:

https://docs.cert-manager.io/en/latest/tasks/issuers/setup-acme/index.html#creating-a-basic-acme-issuer

1. Update apiVersion:

apiVersion: cert-manager.io/v1

2. Add a solvers property:

    solvers:
      - http01:
          ingress:
            class: nginx

The full issuer.yaml manifest can be found below:

apiVersion: cert-manager.io/v1
kind: ClusterIssuer
metadata:
  name: letsencrypt-prod
spec:
  acme:
    server: https://acme-v02.api.letsencrypt.org/directory
    email: "test@test.com"
    privateKeySecretRef:
      name: letsencrypt-prod
    solvers:
      - http01:
          ingress:
            class: nginx