[Prometheus.HttpListener] Avoid array lookup #3947

Job	Run time
automation / resolve-automation	3s
update-releasenotes-on-prepare-pr-post-notice	0s
update-changelog-release-dates-on-prepare-pr-post-notice	0s
create-release-tag-pr-post-notice	0s
prepare-release-pr	0s
lock-pr-and-post-notice-to-create-release-tag	0s
	3s

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