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Replicas that each refresh an expiring credential race each other and waste provider calls. A work-queue stream with one request per credential and one shared consumer lets exactly one replica win each request, and duplicate requests are refused instead of queued twice. The consumer keeps a running handler alive with progress signals so a slow provider call is not redelivered to a second replica mid-refresh. Signed-off-by: Yordis Prieto <yordis.prieto@gmail.com>
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Refresh requests need one place to wait so that exactly one replica handles each. A work-queue stream with dedupe gives that without a coordinator, and a request that nobody handles expires instead of piling up.