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That’s correct. In my understanding if block_log is delayed by >3 seconds there is something wrong and I need to check it. It’s very simple check, but I was able to detect few serious Steem blockchain issues and take action before loosing block. ;-)

makes sense. I was looking at "triggers" for the fail over and also talking to @petertag to have a proper fail over tool. So this is one of the conditions that can help. Right now I am manually doing failover between the primary and secondary.