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数据拉取配置

scrape_configs 主要用于配置拉取数据节点，每一个拉取配置主要包含以下参数：

  • job_name：任务名称

  • honor_labels： 用于解决拉取数据标签有冲突，当设置为 true, 以拉取数据为准，否则以服务配置为准

  • params：数据拉取访问时带的请求参数

  • scrape_interval： 拉取时间间隔

  • scrape_timeout: 拉取超时时间

  • metrics_path： 拉取节点的 metric 路径

  • scheme： 拉取数据访问协议

  • sample_limit： 存储的数据标签个数限制，如果超过限制，该数据将被忽略，不入存储；默认值为0，表示没有限制

  • relabel_configs： 拉取数据重置标签配置

  • metric_relabel_configs：metric 重置标签配置

其代码结构体定义为：

// ScrapeConfig configures a scraping unit for Prometheus.
type ScrapeConfig struct {
    // The job name to which the job label is set by default.
    JobName string `yaml:"job_name"`
    // Indicator whether the scraped metrics should remain unmodified.
    HonorLabels bool `yaml:"honor_labels,omitempty"`
    // A set of query parameters with which the target is scraped.
    Params url.Values `yaml:"params,omitempty"`
    // How frequently to scrape the targets of this scrape config.
    ScrapeInterval model.Duration `yaml:"scrape_interval,omitempty"`
    // The timeout for scraping targets of this config.
    ScrapeTimeout model.Duration `yaml:"scrape_timeout,omitempty"`
    // The HTTP resource path on which to fetch metrics from targets.
    MetricsPath string `yaml:"metrics_path,omitempty"`
    // The URL scheme with which to fetch metrics from targets.
    Scheme string `yaml:"scheme,omitempty"`
    // More than this many samples post metric-relabelling will cause the scrape to fail.
    SampleLimit uint `yaml:"sample_limit,omitempty"`

    // We cannot do proper Go type embedding below as the parser will then parse
    // values arbitrarily into the overflow maps of further-down types.

    ServiceDiscoveryConfig ServiceDiscoveryConfig `yaml:",inline"`
    HTTPClientConfig       HTTPClientConfig       `yaml:",inline"`

    // List of target relabel configurations.
    RelabelConfigs []*RelabelConfig `yaml:"relabel_configs,omitempty"`
    // List of metric relabel configurations.
    MetricRelabelConfigs []*RelabelConfig `yaml:"metric_relabel_configs,omitempty"`

    // Catches all undefined fields and must be empty after parsing.
    XXX map[string]interface{} `yaml:",inline"`
}

以上配置定义中还包含 ServiceDiscoveryConfig，它的代码定义为：

ServiceDiscoveryConfig 主要用于 target 发现，大体分为两类，静态配置和动态发现。

所以，一份完整的 scrape_configs 配置大致为：

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