Metrics for feature engagement tracker.

components/feature_engagement_tracker/internal/stats.h

Index: components/feature_engagement_tracker/internal/stats.h
diff --git a/components/feature_engagement_tracker/internal/stats.h b/components/feature_engagement_tracker/internal/stats.h
new file mode 100644
index 0000000000000000000000000000000000000000..7171a3201f2c5ec0d6041c768bda6ac8089b08ab
--- /dev/null
+++ b/components/feature_engagement_tracker/internal/stats.h
@@ -0,0 +1,150 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_STATS_H_
+#define COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_STATS_H_
+
+#include <string>
+#include <vector>
+
+#include "components/feature_engagement_tracker/internal/condition_validator.h"
+#include "components/feature_engagement_tracker/internal/configuration.h"
+#include "components/feature_engagement_tracker/internal/proto/event.pb.h"
+
+namespace feature_engagement_tracker {
+namespace stats {
+
+// Enum used in the metrics to record the result when in-product help UI is
+// going to be triggered.
+// Most of the fields maps to |ConditionValidator::Result|.
+// The failure reasons are not mutually exclusive.
+// Out-dated entries shouldn't be deleted but marked as obselete.
+enum class TriggerHelpUIResult {
+  // The help UI is triggered.
+  SUCCESS = 0,
+
+  // The help UI is not triggered.
+  FAILURE = 1,
+
+  // Data layer is not ready.
+  FAILURE_MODEL_NOT_READY = 2,
+
+  // Some other help UI is currently showing.
+  FAILURE_CURRENTLY_SHOWING = 3,
+
+  // The feature is disabled.
+  FAILURE_FEATURE_DISABLED = 4,
+
+  // Configuration can not be parsed.
+  FAILURE_CONFIG_INVALID = 5,
+
+  // Used event precondition is not satisfied.
+  FAILURE_USED_PRECONDITION_UNMET = 6,
+
+  // Trigger event precondition is not satisfied.
+  FAILURE_TRIGGER_PRECONDITION_UNMET = 7,
+
+  // Other event precondition is not satisfied.
+  FAILURE_OTHER_PRECONDITION_UNMET = 8,
+
+  // Session rate does not meet the requirement.
+  FAILURE_SESSION_RATE = 9,
+
+  // Availability mode is not ready.
+  FAILURE_AVAILABILITY_MODEL_NOT_READY = 10,
+
+  // Availability precondition is not satisfied.
+  FAILURE_AVAILABILITY_PRECONDITION_UNMET = 11,
+
+  // Last entry for the enum.
+  COUNT = 12,
+};
+
+// Used in the metrics to track the configuration parsing event.
+// The failure reasons are not mutually exclusive.
+// Out-dated entries shouldn't be deleted but marked as obsolete.
+enum class ConfigParsingEvent {
+  // The configuration is parsed correctly.
+  SUCCESS = 0,
+
+  // The configuration is invalid after parsing.
+  FAILURE = 1,
+
+  // Fails to parse the feature config because no field trial is found.
+  FAILURE_NO_FIELD_TRIAL = 2,
+
+  // Fails to parse the used event.
+  FAILURE_USED_EVENT_PARSE = 3,
+
+  // Used event is missing.
+  FAILURE_USED_EVENT_MISSING = 4,
+
+  // Fails to parse the trigger event.
+  FAILURE_TRIGGER_EVENT_PARSE = 5,
+
+  // Trigger event is missing.
+  FAILURE_TRIGGER_EVENT_MISSING = 6,
+
+  // Fails to parse other events.
+  FAILURE_OTHER_EVENT_PARSE = 7,
+
+  // Fails to parse the session rate comparator.
+  FAILURE_SESSION_RATE_PARSE = 8,
+
+  // Fails to parse the availability comparator.
+  FAILURE_AVAILABILITY_PARSE = 9,
+
+  // UnKnown key in configuration parameters.
+  FAILURE_UNKNOWN_KEY = 10,
+
+  // Last entry for the enum.
+  COUNT = 11,
+};
+
+// Used in metrics to track database states. Each type will match to a suffix
+// in the histograms to identify the database.
+enum class StoreType {
+  // Events store.
+  EVENTS_STORE = 0,
+
+  // Availability store.
+  AVAILABILITY_STORE = 1,
+};
+
+// Helper function that converts a store type to histogram suffix string.
+std::string ToDbHistogramSuffix(StoreType type);
+
+// Records the feature engagement events. Used event will be tracked
+// separately.
+void RecordNotifyEvent(const std::string& event,
+                       const Configuration* config,
+                       bool is_model_ready);
+
+// Records user action and the result histogram when in-product help will be
+// shown to the user.
+void RecordShouldTriggerHelpUI(const base::Feature& feature,
+                               const ConditionValidator::Result& result);
+
+// Records when the user dismisses the in-product help UI.
+void RecordUserDismiss();
+
+// Records the result of database updates.
+void RecordDbUpdate(bool success, StoreType type);
+
+// Record database init.
+void RecordDbInitEvent(bool success, StoreType type);
+
+// Records events database load event.
+void RecordEventDbLoadEvent(bool success, const std::vector<Event>& events);
+
+// Records availability database load event.
+void RecordAvailabilityDbLoadEvent(bool success);
+
+// Records configuration parsing event.
+void RecordConfigParsingEvent(ConfigParsingEvent event);
+
+}  // namespace stats
+}  // namespace feature_engagement_tracker
+
+#endif  // COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_STATS_H_