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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_METRICS_METRICS_FEATURES_H_
#define COMPONENTS_METRICS_METRICS_FEATURES_H_
#include "base/feature_list.h"
#include "base/metrics/field_trial_params.h"
namespace metrics::features {
// Determines at what point the metrics service is allowed to close a log when
// Chrome is closed (and backgrounded/foregrounded for mobile platforms). When
// this feature is disabled, the metrics service can only close a log if it has
// already started sending logs. When this feature is enabled, the metrics
// service can close a log starting from when the first log is opened.
BASE_DECLARE_FEATURE(kMetricsServiceAllowEarlyLogClose);
// This can be used to disable structured metrics as a whole.
BASE_DECLARE_FEATURE(kStructuredMetrics);
#if BUILDFLAG(IS_ANDROID)
// Determines whether to merge histograms from child processes when Chrome is
// backgrounded/foregrounded. Only on Android.
BASE_DECLARE_FEATURE(kMergeSubprocessMetricsOnBgAndFg);
#endif // BUILDFLAG(IS_ANDROID)
// Determines whether to allow merging subprocess metrics asynchronously. By
// itself, the feature does nothing. But the different params below allow
// toggling specific async behaviours.
BASE_DECLARE_FEATURE(kSubprocessMetricsAsync);
// Determines whether to merge subprocess metrics asynchronously when creating
// periodic ongoing UMA logs.
extern const base::FeatureParam<bool> kPeriodicMergeAsync;
// Determines whether to merge the last metrics of a subprocess that has just
// exited asynchronously.
extern const base::FeatureParam<bool> kDeregisterAsync;
// Determines whether the tasks posted when deregistering a subprocess
// asynchronously are sequenced. This param only applies when |kDeregisterAsync|
// is true.
extern const base::FeatureParam<bool> kDeregisterSequenced;
// Determines whether to schedule a flush of persistent histogram memory
// immediately after writing a system profile to it.
BASE_DECLARE_FEATURE(kFlushPersistentSystemProfileOnWrite);
// Determines whether to perform histogram delta snapshots in a background
// thread (in contrast to snapshotting unlogged samples in the background, then
// marking them as logged on the main thread).
BASE_DECLARE_FEATURE(kMetricsServiceDeltaSnapshotInBg);
// Determines whether to always flush Local State immediately after an UMA/UKM
// log upload. If this is disabled, Local State is only immediately flushed
// after an upload if this is a mobile platform and the browser is in the
// background.
BASE_DECLARE_FEATURE(kReportingServiceAlwaysFlush);
} // namespace metrics::features
#endif // COMPONENTS_METRICS_METRICS_FEATURES_H_
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