Commit 6b3f0d65 authored by Pierre Imai's avatar Pierre Imai
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Ignore unreliable DNS servers. 

Collect statistics about DNS query success state and delay. Ignore
servers that have been tried at least five times and have a success rate
of < 0.25. Retry these servers once every 180s.

Bug: 25731675
Change-Id: I78e24f43e388dca82fb81835e1796f4c7dce8da3
parent e725dc16
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