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The "hold obsolete" timer is used to prevent HAProxy from moving a server to an other IP or from considering the server as DOWN if the IP currently affected to this server has not been seen for this period of time in DNS responses. That said, historically, HAProxy used to update servers as soon as the IP has disappeared from the response. Current default timeout break this historical behavior and may change HAProxy's behavior when people will upgrade to 1.8. This patch changes the default value to 0 to keep backward compatibility.