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The MW code for getting pt-heartbeat lag checks the row for Master_Server_Id (from the slave status), which for master => slave1 => slave2, would check for the slave1 id entry (which wouldn't even exist since only the true masters get table updates for their server IDs)

The MW code for getting pt-heartbeat lag checks the row for Master_Server_Id (from the slave status), which for master => slave1 => slave2, would check for the slave1 id entry (which wouldn't even exist since only the true masters get table updates for their server IDs)

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