- check_dns
- [normal]
- 127.0.0.1
- DNS ok - +[\.0-9]+ seconds response time, Address\(es\) is\/are 127\.0\.0\.1
- [critical]
- $nullhost
- DNS (problem - Probably a non-existent host/domain|CRITICAL - Non-existent host/domain|CRITICAL - Connection timed out after [0-9]+ seconds)
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