chromium/components/metrics/metrics_log_store.h

// Copyright 2017 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_LOG_STORE_H_
#define COMPONENTS_METRICS_METRICS_LOG_STORE_H_

#include <memory>
#include <optional>
#include <string>
#include <string_view>

#include "base/metrics/histogram_base.h"
#include "base/sequence_checker.h"
#include "components/metrics/log_store.h"
#include "components/metrics/metrics_log.h"
#include "components/metrics/metrics_logs_event_manager.h"
#include "components/metrics/unsent_log_store.h"

class PrefService;
class PrefRegistrySimple;

namespace metrics {

class MetricsServiceClient;

// A LogStore implementation for storing UMA logs.
// This implementation keeps track of two types of logs, initial and ongoing,
// each stored in UnsentLogStore. It prioritizes staging initial logs over
// ongoing logs.
//
// An alternate log store can be set to persist ongoing logs. For example, this
// can be used to separate user logs from device logs on Chrome OS. If set, all
// ongoing logs will be written to this alternate log store. Ongoing logs from
// the alternate log store will be prioritized over ongoing logs from the native
// ongoing log store when logs are staged. If an alternate log store is bound,
// then logs will be prioritized in the following order: initial, alternate
// ongoing, native ongoing.
class MetricsLogStore : public LogStore { … };

}  // namespace metrics

#endif  // COMPONENTS_METRICS_METRICS_LOG_STORE_H_