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Traffic mirroring is a pre-stage for canary deployments. When mirroring is enabled, at the beginning of a canary deployment traffic is mirrored to the canary instead of shifted for one canary period. The service mesh should mirror by copying the request and sending one copy to the primary and one copy to the canary; only the response from the primary is sent to the user. The response from the canary is only used for collecting metrics. Once the mirror period is over, the canary proceeds as usual, shifting traffic from primary to canary until complete. Added TestScheduler_Mirroring unit test.