Github user abhinandanprateek commented on the pull request:
https://github.com/apache/cloudstack/pull/211#issuecomment-98087158
The way HA is implemented, ânullâ is a valid return value from an
investigator. The valid values are Up, Down or null.
https://cwiki.apache.org/confluence/display/CLOUDSTACK/High+Availability+Developer's+Guide
The other values may not be handled by HA impl., please check.
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