OpenTelemetry Collector能否以拉取方式从其他Collector获取数据？

结论：完全支持从节点主动拉取主节点数据的模式，以下是具体实现思路和配置示例：

1. 主节点配置：暴露可被拉取的数据端点 #

主节点需要将自身处理后的Trace/Metrics/Logs数据，暴露为支持拉取协议的端点，常用两种方案：

方案A：用Prometheus协议暴露指标数据 #

主节点配置prometheus exporter，将Metrics数据暴露为可拉取的HTTP端点：

# 主节点配置片段
exporters:
  prometheus:
    endpoint: "0.0.0.0:9090"  # 主节点对外暴露的拉取地址
    send_timestamps: true

service:
  pipelines:
    metrics:
      receivers: [your-existing-receivers]  # 保留你原有的数据接收配置
      processors: [your-existing-processors]  # 保留你原有的数据处理配置
      exporters: [prometheus]  # 将指标数据导出到暴露端点

方案B：用OTLP+存储扩展支持全量数据类型 #

如果需要拉取Trace或Logs数据，可结合file_storage扩展暂存数据，同时配置otlp receiver允许从节点通过OTLP协议拉取：

# 主节点配置片段
extensions:
  file_storage:
    directory: /var/lib/otelcol/storage
    timeout: 10s

receivers:
  otlp:
    protocols:
      grpc:
        endpoint: "0.0.0.0:4317"
      http:
        endpoint: "0.0.0.0:4318"

service:
  extensions: [file_storage]
  pipelines:
    traces:
      receivers: [your-existing-receivers]
      processors: [memory_limiter, batch]
      exporters: [otlp]  # 将追踪数据转发到自身OTLP Receiver，结合存储实现可拉取
    metrics:
      receivers: [your-existing-receivers]
      processors: [memory_limiter, batch]
      exporters: [otlp]
    logs:
      receivers: [your-existing-receivers]
      processors: [memory_limiter, batch]
      exporters: [otlp]

2. 从节点配置：主动拉取主节点数据 #

从节点根据主节点暴露的协议，配置对应的receiver拉取数据：

对应方案A的从节点配置（拉取Prometheus指标） #

# 从节点配置片段
receivers:
  prometheus:
    config:
      scrape_configs:
        - job_name: "otel-main-node"
          scrape_interval: 15s
          static_configs:
            - targets: ["main-node-ip:9090"]  # 替换为主节点的实际IP和端口

service:
  pipelines:
    metrics:
      receivers: [prometheus]
      processors: [your-processors]  # 配置你需要的数据处理规则
      exporters: [your-target-exporters]  # 导出到目标厂商或应用

对应方案B的从节点配置（拉取OTLP全量数据） #

使用OTLP拉取模式（要求Collector版本≥0.70.0），直接拉取主节点的OTLP端点数据：

# 从节点配置片段
exporters:
  otlp/pull:
    endpoint: "main-node-ip:4317"
    protocol: grpc
    pull_interval: 10s  # 设置拉取间隔

service:
  pipelines:
    traces:
      receivers: [your-local-receivers]  # 保留从节点本地的数据接收配置
      processors: [your-processors]
      exporters: [otlp/pull, your-target-exporters]
    metrics:
      receivers: [your-local-receivers]
      processors: [your-processors]
      exporters: [otlp/pull, your-target-exporters]
    logs:
      receivers: [your-local-receivers]
      processors: [your-processors]
      exporters: [otlp/pull, your-target-exporters]

3. 动态从节点列表的适配 #

由于从节点列表是动态的，主节点无需维护任何从节点信息——所有从节点只需自行配置主节点的拉取端点即可完成接入，完全规避了推送模式下需要维护从节点列表的问题。

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