I find error "probe failed: command timed out" happen frequently in a 4.8 job : https://prow.ci.openshift.org/job-history/origin-ci-test/logs/periodic-ci-openshift-release-master-nightly-4.8-e2e-metal-ipi-serial-ipv4, also can be searched by: https://search.ci.openshift.org/?search=probe+failed%3A+command+timed+out&maxAge=48h&context=1&type=junit&name=&excludeName=&maxMatches=5&maxBytes=20971520&groupBy=job "Jul 21 03:52:28.000 W ns/openshift-kni-infra pod/keepalived-worker-1 node/worker-1 reason/Unhealthy Liveness probe failed: command timed out (3 times)" @Peter Hunt, Can you help to check if the issue haven't been fixed or it just happen by accident.
I can only find one match https://search.ci.openshift.org/?search=probe+failed%3A+command+timed+out&maxAge=336h&context=1&type=junit&name=%5Eperiodic-ci-openshift-release-master-nightly-4%5C.7-e2e-vsphere%24&excludeName=&maxMatches=5&maxBytes=20971520&groupBy=job and I don't think that's indicative of the issue we were seeing
run a 4.8 cluster for a long time, don't find "probe failed: command timed out" events. set it verified.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (OpenShift Container Platform 4.8.3 bug fix update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2021:2896