5.6OpenTelemetry Collector Configuration

# otel-collector-config.yaml
receivers:
  otlp:
    protocols:
      grpc:
        endpoint: 0.0.0.0:4317
      http:
        endpoint: 0.0.0.0:4318

processors:
  batch:
    timeout: 5s
    send_batch_size: 1000

  # Tail-based sampling: keep all error traces, sample 10% of successful traces
  tail_sampling:
    decision_wait: 10s
    policies:
      - name: errors-always
        type: status_code
        status_code: { status_codes: [ERROR] }
      - name: slow-traces
        type: latency
        latency: { threshold_ms: 2000 }
      - name: probabilistic-sample
        type: probabilistic
        probabilistic: { sampling_percentage: 10 }

exporters:
  otlp/tempo:
    endpoint: tempo.monitoring:4317
    tls:
      insecure: true
  prometheus:
    endpoint: 0.0.0.0:8889

service:
  pipelines:
    traces:
      receivers: [otlp]
      processors: [batch, tail_sampling]
      exporters: [otlp/tempo]
    metrics:
      receivers: [otlp]
      processors: [batch]
      exporters: [prometheus]