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Example2: performance is bad or errors rate is up. Need auto rollback 1. Need to be rolledback because 500 erorrs are coming. 2. Solutions may varied from a cronjob that polls the monitoring system to compare and detect 500 errors after it reaches a threshold then apply a command like kubectl deployment undo (check https://github.com/ContainerSolutions/helm-monitor) an fully functional AB rolling release system like argocd or weaveworks flagger ....
You can see in why argo section here what are the limitations of rolling updates and how rollouts solves it: https://github.com/argoproj/argo-rollouts