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Possible to serve 100% traffic during upgrade and rollback?

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My spring boot application is deployed with 6 replicas on Kubernetes using Helm charts. It is currently deployed under load test with 6K TPS traffic. We wanted to test the behavior of ongoing traffic during upgrade of application using helm upgade. During upgrade window we see approximate 0.6 % of request failure. The upgrade strategy is set to rollingUpdate with maxUnavailable and maxSurge set to 25%. My question is , Should we expect 0% failure ? If yes, are there any standard measures that one should adhere to provide 0% failure while upgrading/rollback. Any help or insight would be great.

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