Seamless at DNS discovery and seamless reload

I wonder that connection lost occur or not (seamless, graceful or not)

• when a existing server disappears at a A record from DNS discovery
• when a new server appears at a A record from DNS discovery

I tested them found that there is no connection lost.
But I still wonder it’s really seamless and how it works.
However it is hard to find their answer at document HAProxy version 2.5-dev0 - Configuration Manual. It looks there is no answer about below questions, at the document.

1. When a existing server disappears or a new server appears at a A record from DNS discovery, HAProxy process reloads its configure?

2. If it’s not, HAProxy process just modify its ip from a A record, like echo "set server address" | socat stdio /var/run/hapee-lb.sock? If then, set server address is always seamless?

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