tail sampling with span metrics

otelcol.yaml

exporters:
  logging/traces:
  logging/metrics:
    verbosity: detailed

receivers:
  otlp:
    protocols:
      grpc:

processors:
  tail_sampling:
    decision_wait: 1s
    num_traces: 50_000
    expected_new_traces_per_sec: 10_000
    policies:
      [
          {
            name: only-10-percent,
            type: probabilistic,
            probabilistic: {sampling_percentage: 10}
          },
      ]

connectors:
  spanmetrics:
  forward:

service:
  pipelines:    
    traces:
      receivers:
        - otlp
      exporters:
        - forward
        - spanmetrics

    traces/export:
      receivers:
        - forward
      processors:
        - tail_sampling
      exporters:
        - logging/traces
    
    metrics:
      receivers:
        - spanmetrics
      processors:
      exporters:
        - logging/metrics