dnsdist: Send a latency of 0 over carbon, null over API for down servers #4785
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Short description
It makes no sense to send the previous latency for a server that we know to be down. This PR sends
0over carbon since I don't know of a better way to signal that the value is not set. Not sending the value at all when a server is down results in very weird graphs.Closes #4689.
Checklist
I have: