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I would like to know how the test alert is triggered.
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Each time a Backbone test runs on a node, it compares the result to the alert settings. If that result has exceeded the set threshold (being a failure or high response time) that node goes into an alert status. When that change of status occurs, the node threshold is checked. If at that time, the number of nodes in alert status for that test has met the node threshold, the alert is triggered.
If, when the test runs, the node was already in an alert status and the returned data no longer exceeds the threshold, the status will change back to 'good'. Again, when that alert status changes, the node threshold is checked. If the node threshold is no longer being met, the Condition Improved alert is sent.
For example, a test running from 5 nodes has been configured with Transaction Failure alerting with a node threshold of 3. When the test starts running presumably it is not failing so, the status of each of the nodes is GOOD.
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