# 全局配置 `global` 属于全局的默认配置，它主要包含 4 个属性， - scrape_interval: 拉取 targets 的默认时间间隔。 - scrape_timeout: 拉取一个 target 的超时时间。 - evaluation_interval: 执行 rules 的时间间隔。 - external_labels: 额外的属性，会添加到拉取的数据并存到数据库中。 其代码结构体定义为： ``` // GlobalConfig configures values that are used across other configuration // objects. type GlobalConfig struct { // How frequently to scrape targets by default. ScrapeInterval model.Duration `yaml:"scrape_interval,omitempty"` // The default timeout when scraping targets. ScrapeTimeout model.Duration `yaml:"scrape_timeout,omitempty"` // How frequently to evaluate rules by default. EvaluationInterval model.Duration `yaml:"evaluation_interval,omitempty"` // The labels to add to any timeseries that this Prometheus instance scrapes. ExternalLabels model.LabelSet `yaml:"external_labels,omitempty"` // Catches all undefined fields and must be empty after parsing. XXX map[string]interface{} `yaml:",inline"` } ``` 配置文件结构大概为： ``` global: scrape_interval: 15s # By default, scrape targets every 15 seconds. evaluation_interval: 15s # By default, scrape targets every 15 seconds. scrape_timeout: 10s # is set to the global default (10s). # Attach these labels to any time series or alerts when communicating with # external systems (federation, remote storage, Alertmanager). external_labels: monitor: 'codelab-monitor' ```