Description of problem:
try to deploy heapster only, when specify this paramter https://github.com/openshift/origin-metrics/blob/master/metrics-heapster.yaml#L59,  the metrics deployer will show error and stop. looks like this env var is not in use?

Version-Release number of selected component (if applicable):
openshift/origin-metrics-deployer :latest
also seen in OSE metrics 3.4


Steps:

oc project openshift-infra

oc create -f - <<API
apiVersion: v1
kind: ServiceAccount
metadata:
  name: metrics-deployer
secrets:
- name: metrics-deployer
API

oadm policy add-cluster-role-to-user cluster-admin system:serviceaccount:openshift-infra:metrics-deployer
oadm policy add-role-to-user edit system:serviceaccount:openshift-infra:metrics-deployer
oc secrets new metrics-deployer nothing=/dev/null
oadm policy add-cluster-role-to-user cluster-reader system:serviceaccount:openshift-infra:heapster
oadm policy add-role-to-user view system:serviceaccount:openshift-infra:hawkular -n openshift-infra

oc new-app -f metrics-heapster.yaml --as=system:serviceaccount:openshift-infra:metrics-deployer \
> -p IMAGE_PREFIX=openshift/origin- \
> -p IMAGE_VERSION=latest \
> -p PUBLIC_MASTER_URL=$MASTERURL \
> -p MASTER_URL=$MASTERURL \
> -p MODE=deploy 

error: unexpected parameter name "PUBLIC_MASTER_URL"

Actual results:
Error is shown, and deployer stop. remove this, can deploy heapster successfully.

Expected results:
Deploy only heapster successfully.

Additional info:
n/a