Description of problem:
Can not find any BFD, BGP related metrics in Prometheus pods

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1. Configure BGP +BFD
2. oc exec prometheus-k8s-0 -n openshift-monitoring -- curl localhost:9090/api/v1/query?query=metallb_bfd_control_packet_input
3.

Actual results:
oc exec prometheus-k8s-0 -n openshift-monitoring -- curl localhost:9090/api/v1/query?query=metallb_bfd_control_packet_input
Defaulting container name to prometheus.
Use 'oc describe pod/prometheus-k8s-0 -n openshift-monitoring' to see all of the containers in this pod.
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    63  100    63    0     0  63000      0 --:--:-- --:--:-- --:--:-- 63000{"status":"success","data":{"resultType":"vector","result":[]}}


Expected results:
oc exec prometheus-k8s-0 -n openshift-monitoring -- curl localhost:9090/api/v1/query?query=metallb_bfd_control_packet_input
Defaulting container name to prometheus.
Use 'oc describe pod/prometheus-k8s-0 -n openshift-monitoring' to see all of the containers in this pod.
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   346  100   346    0     0   168k      0 --:--:-- --:--:-- --:--:--  168k
{"status":"success","data":{"resultType":"vector","result":[{"metric":{"__name__":"metallb_bfd_control_packet_input","container":"frr-metrics","endpoint":"monitoring","instance":"10.46.55.117:7473","job":"metallb-system/metallb-speaker","namespace":"metallb-system","peer":"10.46.55.37","pod":"speaker-n6lzz"},"value":[1639999734.644,"15709"]}]}}

Additional info: