dns: make query_name optional; fallback to target hostname when omitted #1483
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…ed; update documentation accordingly
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Makes dns.query_name optional. When omitted the prober uses the hostname part of target. Rationale: simplifies common configs and reduces duplication. Changes: remove mandatory check in DNSProbe.UnmarshalYAML; derive qName in prober/dns.go; update documentation. Backward compatibility: existing configs continue to work. Tests: keep explicit query_name behavior and add fallback coverage.