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A comment on Ask HN: large system monitoring. Parent comment

Re:Ask HN: large system monitoring by gaius on Saturday January 24, 2009 @11:19AM (#448189)
Nagios is OK for "is X > Y?" type alerting, but it's very poor at "has X changed since T?" and forget "is X greater than it was 24 hours ago AND greater than it was 1 week ago and is Y as well, then page me".
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Re:Ask HN: large system monitoring by nailer on Sunday January 25, 2009 @05:25AM (#448994)
Apparently it also has scalability problems with very large networks - ask the Facebook Site Reliability team. They have 20,000 servers and tried to make Nagios work repeatedly before writing their own tools
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