[6.x] Fix generic DetectsLostConnection string #35323
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This was referenced Mar 13, 2021
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This PR: #31539 introduced a bug #35321 and potentially more bugs that haven't been reported yet. The issue is that the
DetectsLostConnectionstring added ("connection refused") is way too generic and may be caused by any TCP/IP service that's unable to connect (isn't limited to lost DB connections). Based on the original PR stack trace, I've narrowed it down to make it specific to lost database connections.Closes #35321.