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update backend-alarm.md, support op "=" to "==" (#8334)

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zhyyu 2021-12-24 17:23:21 +08:00 committed by GitHub
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@ -30,6 +30,8 @@ Release Notes.
#### Documentation
* update backend-alarm.md doc, support op "=" to "==".
All issues and pull requests are [here](https://github.com/apache/skywalking/milestone/112?closed=1)
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docs/en/setup/backend/backend-alarm.md
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@ -40,7 +40,7 @@ The four label settings mentioned above must implement `LabeledValueHolder`.*
For multiple-value metrics, such as **percentile**, the threshold is an array. It is described as: `value1, value2, value3, value4, value5`.
Each value may serve as the threshold for each value of the metrics. Set the value to `-` if you do not wish to trigger the alarm by one or more of the values.
For example in **percentile**, `value1` is the threshold of P50, and `-, -, value3, value4, value5` means that there is no threshold for P50 and P75 in the percentile alarm rule.
- **OP**. The operator. It supports `>`, `>=`, `<`, `<=`, `=`. We welcome contributions of all OPs.
- **OP**. The operator. It supports `>`, `>=`, `<`, `<=`, `==`. We welcome contributions of all OPs.
- **Period**. The size of metrics cache in minutes for checking the alarm conditions. This is a time window that corresponds to the backend deployment env time.
- **Count**. Within a period window, if the number of times which **value** goes over the threshold (based on OP) reaches `count`, then an alarm will be sent.
- **Only as condition**. Indicates if the rule can send notifications, or if it simply serves as an condition of the composite rule.