[dns-operations] Short DLV outage last weekend

[Michael Graff]

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DLV experienced a 6 minute service interruption on April 11 at midnight
UTC.  This was caused by an error in a re-signing script error which we
believed to have been fixed.  We had staff on-hand to watch the
re-signing, and the zone was quickly rolled-back to a working copy.

We have now added additional human verification steps to ensure that a
DLV zone is not published incorrectly.  Development and testing of
additional script-based checking to assist in this verification is under
way.

Although the DLV web front-end had some loss of connectivity during
April 9th when most of the Bay area was out of service due to malicious
fiber damage, ISC's SNS service, which serves DLV, was unaffected.

- --Michael
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