chromium/components/metrics/metrics_data_validation.cc

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "components/metrics/metrics_data_validation.h"

#include "base/feature_list.h"
#include "base/metrics/field_trial_params.h"
#include "base/numerics/safe_conversions.h"

namespace metrics {
namespace internal {

// Used to assess the reliability of field trial data by injecting different
// levels of effects to pseudo metrics. These pseudo metrics are just mirrors of
// some existing metrics.
BASE_FEATURE(…);

// The multiplicative factor to apply to all samples. Modified samples will be
// recorded in a pseudo metric alongside with the real metric.
const base::FeatureParam<double> kMultiplicativeFactor{ … };

// The additive factor to apply to every samples. For time metrics, we'll add
// |additive_factor| milliseconds to samples. Modified samples will be recorded
// in a pseudo metric alongside with the real metric.
const base::FeatureParam<double> kAdditiveFactor{ … };

}  // namespace internal

BASE_FEATURE(…);

const base::FeatureParam<double> kLogNormalMean{ … };
const base::FeatureParam<double> kLogNormalDelta{ … };
const base::FeatureParam<double> kLogNormalStdDev{ … };

double GetPseudoMetricsSample(double sample) { … }

base::TimeDelta GetPseudoMetricsSample(base::TimeDelta sample) { … }

}  // namespace metrics