PPM Support Tip: Can the upgrade_XXX directories under PPM_HOME be safely deleted?
Knowledge base article: KM00893682
Is it safe to delete the $PPM_HOME/upgrade_XXX directory after doing the upgrade?
The directories mostly have the upgrade logs, so they can move to a different location safely, but it recommended to retain them for future reference if we need to look back at any possible upgrade issues in the logs.
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