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* Kubernetes
  * Fixed a failure to update routing data after restarting watches (#1674).
  * Ensured that Kubernetes API watch events earlier than the current state are ignored (#1681).
* Added support for Istio Mixer precondition checks (#1606).
* Removed spurious error message logging from Consul namer (#1682).
* Changed DNS SRV record namer to use system DNS resolver configuration (#1679).
* Added `timestampHeader` configuration to support New Relic request queue (#1672).