Once changes in NETOBSERV-2148 is merged which relies on RHEL-83254 (targets RHEL 9.4.z) ebpf-agent wouldn't work for PCA for OCP < 4.16, we should add a known limitation in docs and also in CLI logs to notify on this.

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• Add a know limitation in the release notes downstream
• ensure eBPF agent logs are display when you try to run a PCA on old openshift versions
  • It would be good to point to a solution that explain how to use older ebpf agent containers

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Agent image can be overridden using the NETOBSERV_AGENT_IMAGE environment variable such as:

$ export NETOBSERV_AGENT_IMAGE=registry.redhat.io/network-observability/network-observability-ebpf-agent-rhel9@sha256:99418f225c6b0dc3e0d4286e625e1ea77e1fd5ccf6c27b91d17968b2840a441d

The CLI will confirm using the mentionned image at startup:

$ oc netobserv flows --sampling=50
using custom agent image registry.redhat.io/network-observability/network-observability-ebpf-agent-rhel9@sha256:99418f225c6b0dc3e0d4286e625e1ea77e1fd5ccf6c27b91d17968b2840a441d 
Checking dependencies...