Merge pull request kubernetes#76801 from logicalhan/metrics-owners

add owners file to util/metrics and auto-labeling

Author: k8s-ci-robot

pkg/util/metrics/OWNERS

@@ -0,0 +1,9 @@
+# See the OWNERS docs at https://go.k8s.io/owners
+
+approvers:
+- piosz
+- brancz
+reviewers:
+- sig-instrumentation-pr-reviews
+labels:
+- sig/instrumentation