Once we have the API for configuring the heartbeat interval and leader election timeouts from https://github.com/openshift/api/pull/1538 we will need to reconcile the tuning profile set on the API onto the actual etcd deployment.

This would require updating how we set the env vars for both parameters by first reading the operator.openshift.io/v1alpha1 Etcd "cluster" object and mapping the profile value to the required heartbeat and leader election timeout values in:
https://github.com/openshift/cluster-etcd-operator/blob/381ffb81706699cdadd0735a52f9d20379505ef7/pkg/etcdenvvar/etcd_env.go#L208-L254