Upgrading from v1.18 to v1.19

Before upgrading cert-manager from 1.18 to 1.19, please read the following important notes about breaking changes:

Potentially Breaking: ACME metrics label changes

A high cardinality label, called path, was removed from the certmanager_acme_client_request_count and certmanager_acme_client_request_duration_seconds metrics. It is replaced with a new bounded cardinality label called action. If you are using these metrics, you may need to update your dashboards and alerts.

1. Update any dashboards and alerts that using the old path label, to use the new bounded action label.
2. If you rely on the high-cardinality path label, consider adding a Prometheus relabeling or recording rule to preserve the prior semantics (but beware of storage and cost).

Next Steps

From here on, you can follow the regular upgrade process.