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Only log host online events if host was offline

Simon Tomlinson requested to merge stomlinson/less-load-balancer-host-online-logs into master

What does this MR do and why?

host_online messages were generating the bulk of the 150K messages per minute that we're logging for database load balancing now that the logs are fixed.

These messages aren't necessary unless the online state of the host is changing, so only log them if the host was previously offline.

See #424391 (closed)

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