配置Grafana Agent适配Nginx遇阻，求参数填充指引

我尝试为Nginx配置Grafana Agent的grafana-agent.yml文件，但多次尝试均未成功。官方提供的包含Nginx相关配置的示例文件如下：

integrations:
  agent:
    enabled: true
    relabel_configs:
    - action: replace
      source_labels:
      - agent_hostname
      target_label: instance
    metric_relabel_configs:
    - action: keep
      regex: (prometheus_target_.*|prometheus_sd_discovered_targets|agent_build.*|agent_wal_samples_appended_total|process_start_time_seconds)
      source_labels:
      - __name__
  prometheus_remote_write:
  - basic_auth:
      password: <your_prom_pass>
      username: <your_prom_user>
    url: <your_prom_url>
logs:
  configs:
  - clients:
    - basic_auth:
        password: <your_loki_pass>
        username: <your_loki_user>
      url: <your_loki_url>
    name: integrations
    positions:
      filename: /tmp/positions.yaml
    scrape_configs:
    - job_name: integrations/nginx
      static_configs:
      - targets:
        - localhost
        labels:
          host: <http_hostname>
          __path__: <path to json nginx access log>
metrics:
  configs:
  - name: integrations
    remote_write:
    - basic_auth:
        password: <your_prom_pass>
        username: <your_prom_user>
      url: <your_prom_url>
    scrape_configs:
  global:
    scrape_interval: 60s
  wal_directory: /tmp/grafana-agent-wal

但我不清楚metrics.config.basic_auth.password、logs.configs.scrape_configs.targets.host等字段应填入的具体信息，也找不到更详实的示例配置文档，特此求助。

核心字段说明 #

1. 远程写入相关字段（Prometheus/Loki） #

这些字段用来把采集到的指标/日志发送到你的Grafana Stack（Prometheus或Loki），需要对应你的服务实际配置：

• <your_prom_user>/<your_prom_pass>：Prometheus实例开启Basic Auth后的用户名和密码，没开认证可以直接删掉basic_auth块
• <your_prom_url>：Prometheus的远程写入接口地址，比如http://192.168.1.100:9090/api/v1/write
• <your_loki_user>/<your_loki_pass>：Loki实例开启Basic Auth后的用户名和密码，同样，没开认证可删除该块
• <your_loki_url>：Loki的日志推送接口地址，比如http://192.168.1.101:3100/loki/api/v1/push

2. Nginx日志采集相关字段 #

• <http_hostname>：你的Nginx服务对应的域名或主机名，比如blog.example.com，用来给日志打标签，方便后续在Grafana中按主机筛选
• <path to json nginx access log>：Nginx JSON格式访问日志的绝对路径，比如/var/log/nginx/access.log（注意：必须是JSON格式，需要先配置Nginx输出JSON日志）

3. Nginx指标采集补充 #

原官方示例的metrics.configs.scrape_configs是空的，这是关键问题——要获取Nginx运行指标（连接数、请求数等），必须添加指标采集配置。前提是你的Nginx已经安装ngx_http_stub_status_module模块，并且配置了状态端点（比如/status）。

完整修正后的配置示例 #

integrations:
  agent:
    enabled: true
    relabel_configs:
    - action: replace
      source_labels:
      - agent_hostname
      target_label: instance
    metric_relabel_configs:
    - action: keep
      regex: (prometheus_target_.*|prometheus_sd_discovered_targets|agent_build.*|agent_wal_samples_appended_total|process_start_time_seconds)
      source_labels:
      - __name__
  prometheus_remote_write:
  - basic_auth:
      password: "your-real-prom-password"
      username: "your-real-prom-username"
    url: "http://192.168.1.100:9090/api/v1/write"
logs:
  configs:
  - clients:
    - basic_auth:
        password: "your-real-loki-password"
        username: "your-real-loki-username"
      url: "http://192.168.1.101:3100/loki/api/v1/push"
    name: integrations
    positions:
      filename: /tmp/positions.yaml
    scrape_configs:
    - job_name: integrations/nginx
      static_configs:
      - targets:
        - localhost
        labels:
          host: "blog.example.com"
          __path__: "/var/log/nginx/access.log"
      # 解析JSON日志的规则，对应你Nginx的JSON日志字段
      json:
        expressions:
          remote_addr: remote_addr
          request_method: request_method
          request_uri: request_uri
          status: status
          body_bytes_sent: body_bytes_sent
metrics:
  configs:
  - name: integrations
    remote_write:
    - basic_auth:
        password: "your-real-prom-password"
        username: "your-real-prom-username"
      url: "http://192.168.1.100:9090/api/v1/write"
    scrape_configs:
    - job_name: nginx-metrics
      static_configs:
      - targets: ["localhost:80"] # Nginx状态端点的地址和端口
      metrics_path: "/status" # 你配置的Nginx状态路径
      relabel_configs:
      - source_labels: [__address__]
        target_label: instance
        regex: "(.*):.*"
        replacement: "$1"
  global:
    scrape_interval: 60s
  wal_directory: /tmp/grafana-agent-wal

关键注意事项 #

1. 配置Nginx输出JSON日志：修改Nginx的nginx.conf或站点配置，添加JSON格式的日志模板：

log_format json_log '{"remote_addr":"$remote_addr","request_method":"$request_method","request_uri":"$request_uri","status":$status,"body_bytes_sent":$body_bytes_sent,"request_time":$request_time}';
access_log /var/log/nginx/access.log json_log;

2. 验证Nginx状态端点：访问http://localhost/status，能看到类似如下内容说明配置正常：

Active connections: 2 
server accepts handled requests
  15 15 15 
Reading: 0 Writing: 1 Waiting: 1 

3. 重启并检查Agent：配置完成后重启Grafana Agent：systemctl restart grafana-agent，然后查看日志排查错误：journalctl -u grafana-agent -f

内容的提问来源于stack exchange，提问作者user19884620