KEP:3466: Kubernetes Component Health SLIs (kubernetes#3469)

* Add KEP for healthcheck metrics for Kubernetes components

* update toc

* fix kep metadata

* address comments and update design

* amend approvers/reviewers/prr-reviewers

* add prod readiness approver

* address lavalamp's offline comments and incorporate that into the KEP

* Update keps/sig-instrumentation/3466-healthcheck-metrics/README.md

Co-authored-by: Daniel Smith <[email protected]>

* address lavalamp's comments

* add bit about staleness alerting from the counter

* use full KEP template and address wojtek's comments

* address wojtek's comments

Co-authored-by: Daniel Smith <[email protected]>

Author: Han Kang

keps/prod-readiness/sig-instrumentation/3466.yaml

@@ -0,0 +1,6 @@
+# The KEP must have an approver from the
+# "prod-readiness-approvers" group
+# of http://git.k8s.io/enhancements/OWNERS_ALIASES
+kep-number: 3466
+alpha:
+  approver: "@wojtek-t"