154 lines
7.6 KiB
Markdown
154 lines
7.6 KiB
Markdown
# Alarm
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Alarm core is driven by a collection of rules, which are defined in `config/alarm-settings.yml`.
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There are three parts in alarm rule definition.
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1. [Alarm rules](#rules). They define how metrics alarm should be triggered, what conditions should be considered.
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1. [Webhooks](#webhook). The list of web service endpoint, which should be called after the alarm is triggered.
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1. [gRPCHook](#gRPCHook). The host and port of remote gRPC method, which should be called after the alarm is triggered.
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## Entity name
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Define the relation between scope and entity name.
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- **Service**: Service name
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- **Instance**: {Instance name} of {Service name}
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- **Endpoint**: {Endpoint name} in {Service name}
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- **Database**: Database service name
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- **Service Relation**: {Source service name} to {Dest service name}
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- **Instance Relation**: {Source instance name} of {Source service name} to {Dest instance name} of {Dest service name}
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- **Endpoint Relation**: {Source endpoint name} in {Source Service name} to {Dest endpoint name} in {Dest service name}
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## Rules
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Alarm rule is constituted by following keys
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- **Rule name**. Unique name, show in alarm message. Must end with `_rule`.
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- **Metrics name**. A.K.A. metrics name in oal script. Only long, double, int types are supported. See
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[List of all potential metrics name](#list-of-all-potential-metrics-name).
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- **Include names**. The following entity names are included in this rule. Please follow [Entity name define](#entity-name).
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- **Exclude names**. The following entity names are excluded in this rule. Please follow [Entity name define](#entity-name).
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- **Include names regex**. Provide a regex to include the entity names. If both setting the include name list and include name regex, both rules will take effect.
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- **Exclude names regex**. Provide a regex to exclude the exclude names. If both setting the exclude name list and exclude name regex, both rules will take effect.
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- **Threshold**. The target value.
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For multiple values metrics, such as **percentile**, the threshold is an array. Described like `value1, value2, value3, value4, value5`.
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Each value could the threshold for each value of the metrics. Set the value to `-` if don't want to trigger alarm by this or some of the values.
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Such as in **percentile**, `value1` is threshold of P50, and `-, -, value3, value4, value5` means, there is no threshold for P50 and P75 in percentile alarm rule.
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- **OP**. Operator, support `>`, `>=`, `<`, `<=`, `=`. Welcome to contribute all OPs.
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- **Period**. How long should the alarm rule should be checked. This is a time window, which goes with the
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backend deployment env time.
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- **Count**. In the period window, if the number of **value**s over threshold(by OP), reaches count, alarm
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should send.
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- **Silence period**. After alarm is triggered in Time-N, then keep silence in the **TN -> TN + period**.
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By default, it is as same as **Period**, which means in a period, same alarm(same ID in same
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metrics name) will be trigger once.
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```yaml
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rules:
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# Rule unique name, must be ended with `_rule`.
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endpoint_percent_rule:
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# Metrics value need to be long, double or int
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metrics-name: endpoint_percent
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threshold: 75
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op: <
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# The length of time to evaluate the metrics
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period: 10
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# How many times after the metrics match the condition, will trigger alarm
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count: 3
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# How many times of checks, the alarm keeps silence after alarm triggered, default as same as period.
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silence-period: 10
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service_percent_rule:
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metrics-name: service_percent
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# [Optional] Default, match all services in this metrics
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include-names:
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- service_a
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- service_b
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exclude-names:
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- service_c
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# Single value metrics threshold.
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threshold: 85
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op: <
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period: 10
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count: 4
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service_resp_time_percentile_rule:
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# Metrics value need to be long, double or int
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metrics-name: service_percentile
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op: ">"
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# Multiple value metrics threshold. Thresholds for P50, P75, P90, P95, P99.
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threshold: 1000,1000,1000,1000,1000
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period: 10
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count: 3
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silence-period: 5
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message: Percentile response time of service {name} alarm in 3 minutes of last 10 minutes, due to more than one condition of p50 > 1000, p75 > 1000, p90 > 1000, p95 > 1000, p99 > 1000
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```
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### Default alarm rules
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We provided a default `alarm-setting.yml` in our distribution only for convenience, which including following rules
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1. Service average response time over 1s in last 3 minutes.
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1. Service success rate lower than 80% in last 2 minutes.
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1. Percentile of service response time is over 1s in last 3 minutes
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1. Service Instance average response time over 1s in last 2 minutes, and the instance name matches the regex.
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1. Endpoint average response time over 1s in last 2 minutes.
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1. Database access average response time over 1s in last 2 minutes.
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1. Endpoint relation average response time over 1s in last 2 minutes.
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### List of all potential metrics name
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The metrics names are defined in official [OAL scripts](../../guides/backend-oal-scripts.md), right now
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metrics from **Service**, **Service Instance**, **Endpoint**, **Service Relation**, **Service Instance Relation**, **Endpoint Relation** scopes could be used in Alarm, and the **Database access** same with **Service** scope.
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Submit issue or pull request if you want to support any other scope in alarm.
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## Webhook
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Webhook requires the peer is a web container. The alarm message will send through HTTP post by `application/json` content type. The JSON format is based on `List<org.apache.skywalking.oap.server.core.alarm.AlarmMessage>` with following key information.
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- **scopeId**, **scope**. All scopes are defined in org.apache.skywalking.oap.server.core.source.DefaultScopeDefine.
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- **name**. Target scope entity name. Please follow [Entity name define](#entity-name).
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- **id0**. The ID of the scope entity matched the name. When using relation scope, it is the source entity ID.
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- **id1**. When using relation scope, it will be the dest entity ID. Otherwise, it is empty.
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- **ruleName**. The rule name you configured in `alarm-settings.yml`.
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- **alarmMessage**. Alarm text message.
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- **startTime**. Alarm time measured in milliseconds, between the current time and midnight, January 1, 1970 UTC.
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Example as following
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```json
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[{
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"scopeId": 1,
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"scope": "SERVICE",
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"name": "serviceA",
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"id0": "12",
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"id1": "",
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"ruleName": "service_resp_time_rule",
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"alarmMessage": "alarmMessage xxxx",
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"startTime": 1560524171000
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}, {
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"scopeId": 1,
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"scope": "SERVICE",
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"name": "serviceB",
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"id0": "23",
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"id1": "",
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"ruleName": "service_resp_time_rule",
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"alarmMessage": "alarmMessage yyy",
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"startTime": 1560524171000
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}]
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```
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## gRPCHook
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The alarm message will send through remote gRPC method by `Protobuf` content type.
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The message format with following key information which are defined in `oap-server/server-alarm-plugin/src/main/proto/alarm-hook.proto`.
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Part of protocol looks as following:
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```protobuf
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message AlarmMessage {
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int64 scopeId = 1;
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string scope = 2;
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string name = 3;
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string id0 = 4;
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string id1 = 5;
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string ruleName = 6;
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string alarmMessage = 7;
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int64 startTime = 8;
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}
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```
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## Update the settings dynamically
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Since 6.5.0, the alarm settings can be updated dynamically at runtime by [Dynamic Configuration](dynamic-config.md),
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which will override the settings in `alarm-settings.yml`.
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In order to determine that whether an alarm rule is triggered or not, SkyWalking needs to cache the metrics of a time window for
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each alarm rule, if any attribute (`metrics-name`, `op`, `threshold`, `period`, `count`, etc.) of a rule is changed,
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the sliding window will be destroyed and re-created, causing the alarm of this specific rule to restart again.
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