telemetry:
  instrumentation:
    instruments:
      router:
        http.server.active_requests: false
        http.server.request.duration: false
        "custom.histogram":
          description: "histogram of requests"
          type: histogram
          unit: "unit"
          value: unit
          # This instrument should be triggered on drop as the condition is true
          condition:
            eq:
              - request_header: "always-true"
              - static: "true"