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If you are upgrading an ESXi host, you will also need to check the Service Deployments menu to see if the Guest Introspection Services need to be redeployed. If the Installation Status column displays Succeeded, then no redeployment is required; however, if the Installation Status displays Failed, the Guest Introspection Service VMs need to be redeployed by clicking the Failed status and clicking the Resolve button:

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