The upstream PR is https://github.com/kubernetes-sigs/prometheus-adapter/pull/431
checked with 4.9.0-0.nightly-2021-08-22-070405, prometheus-adapter version is 0.9.0, did not see negative value for `oc adm top nodes`
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 (Moderate: OpenShift Container Platform 4.9.0 bug fix and security 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/RHSA-2021:3759