I need your recommendations as the monitored K8s clusters will be upgraded from V1.19 to 1.21 and then from V 1.21 to V1.25 so have you faced any issues during this upgrade activities, If yes what are the best practices and precautions to avoid such scenario.
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With such an old version of Dynatrace Operator, I would start by upgrading it to the latest version 0.14.1. Only after the Operator upgrade can you proceed with the Kubernetes upgrade. This is unlikely to cause a problem, but it has occurred to me that sometimes individual pods will need to be rebooted several times for OA to start monitoring in Full-Stack mode.