Created
November 4, 2016 18:58
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An example Kapacitor alert
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| stream | |
| // The following stream alerts based on changes in cpu/usage | |
| // Every minute the rate of change for the cpu/usage is calculated | |
| // Alerts are sent out when that rate is unusually high | |
| |from() | |
| .measurement('cpu/usage') | |
| .where(lambda: "type" == 'node' AND "nodename" =~/.*cassandra.*/) | |
| .groupBy('nodename') | |
| |derivative('value') | |
| .unit(60s) | |
| .nonNegative() | |
| |window() | |
| .period(1m) | |
| .every(1m) | |
| |alert() | |
| .id('{{ .Name }}/{{ index .Tags "nodename" }}') | |
| .message('{{ .ID }} is increasing at a {{ .Level }} rate. value:{{ index .Fields "value" }}') | |
| // Sigma is a built in Kapacitor function used to calculate standard deviations | |
| // 2 standard deviations away is about 95% greater than normal | |
| .warn(lambda: sigma("value")> 2) | |
| .crit(lambda: sigma("value")> 2.5) | |
| .slack() | |
| .channel('#alerts') |
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