Only a few cert-manager metrics are available about cert-manager HOT 1 OPEN

$ kubectl get --raw /api/v1/namespaces/cert-manager/services/cert-manager:9402/proxy/metrics
# HELP certmanager_clock_time_seconds DEPRECATED: use clock_time_seconds_gauge instead. The clock time given in seconds (from 1970/01/01 UTC).
# TYPE certmanager_clock_time_seconds counter
certmanager_clock_time_seconds 1.7114653e+09
# HELP certmanager_clock_time_seconds_gauge The clock time given in seconds (from 1970/01/01 UTC).
# TYPE certmanager_clock_time_seconds_gauge gauge
certmanager_clock_time_seconds_gauge 1.7114653e+09
# HELP certmanager_controller_sync_call_count The number of sync() calls made by a controller.
# TYPE certmanager_controller_sync_call_count counter
certmanager_controller_sync_call_count{controller="certificaterequests-approver"} 4
certmanager_controller_sync_call_count{controller="certificaterequests-issuer-acme"} 4
certmanager_controller_sync_call_count{controller="certificaterequests-issuer-ca"} 4
certmanager_controller_sync_call_count{controller="certificaterequests-issuer-selfsigned"} 4
certmanager_controller_sync_call_count{controller="certificaterequests-issuer-vault"} 4
certmanager_controller_sync_call_count{controller="certificaterequests-issuer-venafi"} 4
certmanager_controller_sync_call_count{controller="certificates-issuing"} 4
certmanager_controller_sync_call_count{controller="certificates-key-manager"} 4
certmanager_controller_sync_call_count{controller="certificates-metrics"} 4
certmanager_controller_sync_call_count{controller="certificates-readiness"} 4
certmanager_controller_sync_call_count{controller="certificates-request-manager"} 4
certmanager_controller_sync_call_count{controller="certificates-revision-manager"} 4
certmanager_controller_sync_call_count{controller="certificates-trigger"} 4
certmanager_controller_sync_call_count{controller="clusterissuers"} 2
certmanager_controller_sync_call_count{controller="issuers"} 3

$ k get --raw /api/v1/namespaces/cert-manager/services/cert-manager:9402/proxy/metrics
# HELP certmanager_certificate_expiration_timestamp_seconds The date after which the certificate expires. Expressed as a Unix Epoch Time.
# TYPE certmanager_certificate_expiration_timestamp_seconds gauge
certmanager_certificate_expiration_timestamp_seconds{issuer_group="",issuer_kind="Issuer",issuer_name="test",name="test",namespace="default"} 0
# HELP certmanager_certificate_ready_status The ready status of the certificate.
# TYPE certmanager_certificate_ready_status gauge
certmanager_certificate_ready_status{condition="False",issuer_group="",issuer_kind="Issuer",issuer_name="test",name="test",namespace="default"} 1
certmanager_certificate_ready_status{condition="True",issuer_group="",issuer_kind="Issuer",issuer_name="test",name="test",namespace="default"} 0
certmanager_certificate_ready_status{condition="Unknown",issuer_group="",issuer_kind="Issuer",issuer_name="test",name="test",namespace="default"} 0
# HELP certmanager_certificate_renewal_timestamp_seconds The number of seconds before expiration time the certificate should renew.
# TYPE certmanager_certificate_renewal_timestamp_seconds gauge
certmanager_certificate_renewal_timestamp_seconds{issuer_group="",issuer_kind="Issuer",issuer_name="test",name="test",namespace="default"} 0
# HELP certmanager_clock_time_seconds DEPRECATED: use clock_time_seconds_gauge instead. The clock time given in seconds (from 1970/01/01 UTC).
# TYPE certmanager_clock_time_seconds counter
certmanager_clock_time_seconds 1.711465478e+09
# HELP certmanager_clock_time_seconds_gauge The clock time given in seconds (from 1970/01/01 UTC).
# TYPE certmanager_clock_time_seconds_gauge gauge
certmanager_clock_time_seconds_gauge 1.711465478e+09
# HELP certmanager_controller_sync_call_count The number of sync() calls made by a controller.
# TYPE certmanager_controller_sync_call_count counter
certmanager_controller_sync_call_count{controller="certificaterequests-approver"} 7
certmanager_controller_sync_call_count{controller="certificaterequests-issuer-acme"} 7
certmanager_controller_sync_call_count{controller="certificaterequests-issuer-ca"} 7
certmanager_controller_sync_call_count{controller="certificaterequests-issuer-selfsigned"} 7
certmanager_controller_sync_call_count{controller="certificaterequests-issuer-vault"} 7
certmanager_controller_sync_call_count{controller="certificaterequests-issuer-venafi"} 7
certmanager_controller_sync_call_count{controller="certificates-issuing"} 11
certmanager_controller_sync_call_count{controller="certificates-key-manager"} 9
certmanager_controller_sync_call_count{controller="certificates-metrics"} 8
certmanager_controller_sync_call_count{controller="certificates-readiness"} 12
certmanager_controller_sync_call_count{controller="certificates-request-manager"} 12
certmanager_controller_sync_call_count{controller="certificates-revision-manager"} 11
certmanager_controller_sync_call_count{controller="certificates-trigger"} 11
certmanager_controller_sync_call_count{controller="clusterissuers"} 2
certmanager_controller_sync_call_count{controller="issuers"} 3