The fix is available on this build:
https://brewweb.engineering.redhat.com/brew/buildinfo?buildID=608943

Tested with metrics-hawkular-metrics:3.7.0-0.159.0.0
Steps:
1. Add more spaces to the end of "-----BEGIN CERTIFICATE-----" in /etc/origin/master/ca-bundle.crt.
2. Restart server and deploy metrics 3.7 by using image metrics-hawkular-metrics:3.7.0-0.159.0.0 
3. #oc rsh ${HAWKULAR_METRICS_PODS};
   sh-4.2$cat /var/run/secrets/kubernetes.io/serviceaccount/ca.crt

   #oc rsh ${HAWKULAR_CASSANDRA_PODS};
   sh-4.2$cat /var/run/secrets/kubernetes.io/serviceaccount/ca.crt

   #oc rsh ${HEAPSTER_PODS};
   sh-4.2$cat /var/run/secrets/kubernetes.io/serviceaccount/ca.crt

"-----BEGIN CERTIFICATE-----" field don't have spaces in /var/run/secrets/kubernetes.io/serviceaccount/ca.crt of each pod, beside this, the content is thse same with /etc/origin/master/ca-bundle.crt.

4. Sanity testing of Metrics, it works well.

env:
# openshift version
openshift v3.7.0-0.143.7
kubernetes v1.7.0+80709908fd
etcd 3.2.1

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, 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-2017:3188