Query below to identify list of Webapps excluded from Sync table in configDB
SELECT CAST(properties AS XML)AS Props
FROM[SP_Config].[dbo].[Objects] WITH (NOLOCK)where Properties LIKE'%m_WebApplicationSyncExcludeList%'
SELECT CAST(properties AS XML)AS Props
FROM[SP_Config].[dbo].[Objects] WITH (NOLOCK)where Properties LIKE'%m_WebApplicationSyncExcludeList%'