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Sync, Health and Diff in Argo CD: Automated Sync, Prune, Self-Heal and Sync Options

In Argo CD, sync status says whether Git and the cluster match and health status says whether the objects in the cluster work; the two are independent. With real output we see a Synced but Degraded deploy, self-heal undoing a manual scale within a second while missing a manually added env variable, prune deleting a StatefulSet, and Prune=false, ignoreDifferences, RespectIgnoreDifferences and the other sync options.