With cert manager using let's encrypt as it's CA does certificate and private key changes for every renewal in the kubernetes cluster?
If I understand your question, other ACME clients that use Let's Encrypt (like certbot) allow you to create new private keys each time or reuse an existing.
In other words, it is up to the client to manage that. You might have more luck asking about this on the Kubernetes github where people are more familiar with config options for cert-manager.
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