Reenable liveness probe in registry deployment config

[ncdc]

Now that we're no longer trying to support the v1 registry, we should be able to reenable the liveness probe that oadm registry adds to the registry's DC:

origin/pkg/cmd/admin/registry/registry.go

Lines 253 to 265 in 3dd7565

	// TODO reenable the liveness probe when we no longer support the v1 registry.
	/*
	LivenessProbe: &kapi.Probe{
	InitialDelaySeconds: 3,
	TimeoutSeconds: 5,
	Handler: kapi.Handler{
	HTTPGet: &kapi.HTTPGetAction{
	Path: "/healthz",
	Port: util.NewIntOrStringFromInt(5000),
	},
	},
	},
	*/

@smarterclayton @mfojtik @miminar @pweil-

[pweil-]

👍

[ncdc]

I believe the upstream registry has updated their code so GET / should return a 200 instead of a 404. I'm not sure if that's in 2.0.1 (which we're based on) or 2.1.x. We should eventually be able to deprecate and remove our custom /healthz handler, but not right now.

[mfojtik]

+1

[miminar]

Blocked on #4339.

[miminar]

Resolved by #5404.

GET / is used now being used in liveness probe.

[miminar]

@pweil- please close this. #5404 got merged.