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Add recommendation to use Informers to SLO guidance
If an app running in the cluster needs a constantly up-to-date list of objects, and it does so by making repeated LIST calls, that can add very significant load to etcd and the API server, to the point that SLOs are not met. That is exactly the problem that Informers are designed to solve.
As of early 2022, the Haskel and Python libraries are the only officially-supported libraries that do not yet include Informers.
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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.
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/remove-lifecycle rotten /ok-to-test /assign @marseel for an extra set of eyes
