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What do you check to verify an update/upgrade did not break anything?

Question asked by Andrey Kulygin on Jan 18, 2018
Latest reply on Jan 19, 2018 by Edward Davis

What are some of the things to check to make sure a patch or an update did not break any normal processes and functionality? There is a maturity level involved in standard patching that insures confidence when rolling out patches from test environment to production. Once a patch has been applied in test a standard procedure dictates validating all critical processes and functions are still running or available. The question is what specifically are those things that should be verified to validate a patch or an update?