It indicates a "warning" occurred. Warnings are usually explained in <sas-config-dir>\Lev1\Documents\Instructions.html
Alternatively, you can inspect the metadatasrv_configureMetadata_yyyy-mm-dd.hh.ss.log file at <sas-config-dir>\Lev1\Logs\Configure and search for "insertWarning"
One possible cause for the warning is that in the first attempt, the metadatasrv_configureMetadata script created the Metadata Server service in Windows, but then failed for a different reason. Upon hitting Retry, the SAS Deployment Wizard detected that the Metadata Server service already existed in Windows due to the previous execution of the script it and did not recreate the service and threw the warning.
But to confirm, you'd need to inspect Instructions.html and/or the metadatasrv_configureMetadata_yyyy-mm-dd.hh.ss.log
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