processors:
  tail_sampling:
    decision_wait: 10s          # 等待 trace 收齐的时长
    policies:
      - name: errors
        type: status_code
        status_code: { status_codes: [ERROR] }
      - name: slow
        type: latency
        latency: { threshold_ms: 500 }
      - name: baseline
        type: probabilistic
        probabilistic: { sampling_percentage: 10 }