[release-0.15] 🏃 Make client.MatchingLabels faster #2614
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The 99% use-case of this is to set a selector, not to adjust an existing one. This change introduces a fastpath that does that with half the allocations and in a bit less than half the time. The reason slowpath is slow is that for each label a requirement has to be constructed that is then appended to a slice, both of which cause allocations.
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: k8s-infra-cherrypick-robot, sbueringer The full list of commands accepted by this bot can be found here. The pull request process is described here
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This is an automated cherry-pick of #2529
/assign sbueringer