[cloud-user@preserve-olm-env2 jian]$ ./ovnkube-trace --src-namespace netobserv -src flowlogs-pipeline-b5lqc -dst-namespace openshift-dns -dst dns-default-66lw6 -udp -dst-port 53 -loglevel 0
I0321 14:35:16.744185 1320430 ovs.go:90] Maximum command line arguments set to: 191102
ovn-trace source pod to destination pod indicates success from flowlogs-pipeline-b5lqc to dns-default-66lw6
ovn-trace destination pod to source pod indicates success from dns-default-66lw6 to flowlogs-pipeline-b5lqc
ovs-appctl ofproto/trace source pod to destination pod indicates success from flowlogs-pipeline-b5lqc to dns-default-66lw6
ovs-appctl ofproto/trace destination pod to source pod indicates success from dns-default-66lw6 to flowlogs-pipeline-b5lqc
I0321 14:35:21.434256 1320430 ovnkube-trace.go:1181] Skipped ovn-detrace due to: "dependencies check failed: \"ovn-detrace error in pod ovnkube-node-4lkj6, container ovnkube-node. Error 'command terminated with exit code 127', stdOut: ''\\n stdErr: bash: line 1: pip3: command not found\\n\""

Cluster version is 4.13.0-0.nightly-2023-03-19-052243

always

1. Install OCP 4.13

2.  Install ovnlube-trace
$ POD=$(oc get pods -n openshift-ovn-kubernetes -l app=ovnkube-master -o name | head -1 | awk -F '/' '{print $NF}') 
$ oc cp -n openshift-ovn-kubernetes $POD:/usr/bin/ovnkube-trace ovnkube-trace
$ chmod +x ovnkube-trace

3, Run it
$ ./ovnkube-trace --src-namespace netobserv -src flowlogs-pipeline-b5lqc -dst-namespace openshift-dns -dst dns-default-66lw6 -udp -dst-port 53 -loglevel 0

I0321 14:35:21.434256 1320430 ovnkube-trace.go:1181] Skipped ovn-detrace due to: "dependencies check failed: \"ovn-detrace error in pod ovnkube-node-4lkj6, container ovnkube-node. Error 'command terminated with exit code 127', stdOut: ''\\n stdErr: bash: line 1: pip3: command not found\\n\""

Working well

It works well for OCP 4.12