Merge pull request #63597 from liggitt/e2e-metrics-discovery

Automatic merge from submit-queue (batch tested with PRs 63597, 63599). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

don't block e2e namespace cleanup checks on metrics.k8s.io API group

e2e tests discovery persisted resource types and ensure they were cleaned up by namespace deletion

the metrics.k8s.io API group doesn't have any persisted resources, so if there is a discovery error involving that group, we can ignore it for purposes of e2e cleanup checks

```release-note
NONE
```
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Kubernetes Submit Queue 2018-05-09 11:26:09 -07:00 committed by GitHub
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@ -1221,6 +1221,8 @@ func isDynamicDiscoveryError(err error) bool {
// garbage_collector
case "wardle.k8s.io":
// aggregator
case "metrics.k8s.io":
// aggregated metrics server add-on, no persisted resources
default:
Logf("discovery error for unexpected group: %#v", gv)
return false