prometheus alert/record rule

一直不知道官网教程里面的这些规则怎么来的，为什么就是这些字段，会不会还有别的字段？
https://prometheus.io/docs/prometheus/latest/configuration/alerting_rules/#defining-alerting-rules

groups:
- name: example
  rules:
  - alert: HighRequestLatency
    expr: job:request_latency_seconds:mean5m{job="myjob"} > 0.5
    for: 10m
    labels:
      severity: page
    annotations:
      summary: High request latency

代码位置：https://github.com/prometheus/prometheus/blob/master/pkg/rulefmt/rulefmt.go

字段如下：

// RuleGroup is a list of sequentially evaluated recording and alerting rules.
type RuleGroup struct {
	Name     string         `yaml:"name"`
	Interval model.Duration `yaml:"interval,omitempty"`
	Rules    []RuleNode     `yaml:"rules"`
}

// Rule describes an alerting or recording rule.
type Rule struct {
	Record      string            `yaml:"record,omitempty"`
	Alert       string            `yaml:"alert,omitempty"`
	Expr        string            `yaml:"expr"`
	For         model.Duration    `yaml:"for,omitempty"`
	Labels      map[string]string `yaml:"labels,omitempty"`
	Annotations map[string]string `yaml:"annotations,omitempty"`
}

// RuleNode adds yaml.v3 layer to support line and column outputs for invalid rules.
type RuleNode struct {
	Record      yaml.Node         `yaml:"record,omitempty"`
	Alert       yaml.Node         `yaml:"alert,omitempty"`
	Expr        yaml.Node         `yaml:"expr"`
	For         model.Duration    `yaml:"for,omitempty"`
	Labels      map[string]string `yaml:"labels,omitempty"`
	Annotations map[string]string `yaml:"annotations,omitempty"`
}