Displays a list of certificate expirations from both the management and
workload clusters, or in a self-managed cluster. Checks for TLS Secrets,
kubeconf secrets (which gets created while creating the workload cluster) and
also the node certificates present inside /etc/kubernetes/pki directory for
each node

Usage:
  check-certificate-expiration [flags]

Examples:

# To display all the expiring entities in the cluster
airshipctl cluster check-certificate-expiration --kubeconfig testconfig

# To display the entities whose expiration is within threshold of 30 days
airshipctl cluster check-certificate-expiration -t 30 --kubeconfig testconfig

# To output the contents to json (default operation)
airshipctl cluster check-certificate-expiration -o json --kubeconfig testconfig
or
airshipctl cluster check-certificate-expiration --kubeconfig testconfig

# To output the contents to yaml
airshipctl cluster check-certificate-expiration -o yaml --kubeconfig testconfig

# To output the contents whose expiration is within 30 days to yaml
airshipctl cluster check-certificate-expiration -t 30 -o yaml --kubeconfig testconfig


Flags:
  -h, --help                 help for check-certificate-expiration
      --kubeconfig string    Path to kubeconfig associated with cluster being managed
      --kubecontext string   Kubeconfig context to be used
  -o, --output string        Convert output to yaml or json (default "json")
  -t, --threshold int        The max expiration threshold in days before a certificate is expiring. Displays all the certificates by default (default -1)