STUN actor: try to avoid ip address flapping #21
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Reference: Deuxfleurs/diplonat#21
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Delete Branch "stun-keep-values"
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If STUN discovery of public IPv4/IPv6 address returns no address, but an address was found <15m ago, we keep that one. This should protect against temporary failures of the stun discovery mechanism that caused excessive flapping and service restarting in prod and staging clusters.
TODO: test on staging