cryptohome/cryptohome_metrics.h

// Copyright 2014 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CRYPTOHOME_CRYPTOHOME_METRICS_H_
#define CRYPTOHOME_CRYPTOHOME_METRICS_H_

#include <string>

#include <base/files/file.h>
#include <base/time/time.h>
#include <metrics/metrics_library.h>

#include "cryptohome/auth_blocks/auth_block_type.h"
#include "cryptohome/auth_factor/auth_factor.h"
#include "cryptohome/data_migrator/metrics.h"
#include "cryptohome/le_credential_manager.h"
#include "cryptohome/migration_type.h"

namespace cryptohome {

// The derivation types used in the implementations of AuthBlock class.
// Refer to cryptohome/docs/ for more details.
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum DerivationType : int {
  // Derive a high-entropy secret from the user's password using scrypt.
  kScryptBacked = 0,
  // Low-entropy secrets that need brute force protection are mapped to
  // high-entropy secrets that can be obtained via a rate-limited lookup
  // enforced by the TPM/GSC.
  kLowEntropyCredential = 1,
  // Protecting user data via signing cryptographic keys stored on hardware
  // tokens, rather than via passwords. The token needs to present a valid
  // signature for the generated challenge to unseal a secret seed value, which
  // is then used as a KDF passphrase for scrypt to derive the wrapping key.
  // The sealing/unsealing algorithm involves TPM/GSC capabilities for achieving
  // the security strength.
  kSignatureChallengeProtected = 2,
  // TPM/GSC and user passkey is used to derive the wrapping keys which are
  // sealed to PCR.
  kTpmBackedPcrBound = 3,
  // TPM/GSC and user passkey is used to derive the wrapping key.
  kTpmBackedNonPcrBound = 4,
  // Deprecated state - both TPM/GSC and scrypt is being used.
  kDoubleWrapped = 5,
  // Secret is generated on the device and later derived by Cryptohome Recovery
  // process using data stored on the device and by Recovery Mediator service.
  kCryptohomeRecovery = 6,
  // TPM/GSC and user passkey is used to derive the wrapping keys which are
  // sealed to PCR and ECC auth value.
  kTpmBackedEcc = 7,
  kDerivationTypeNumBuckets  // Must be the last entry.
};

// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum CryptohomeErrorMetric {
  kTpmFail = 1,
  kTcsKeyLoadFailed = 2,
  kTpmDefendLockRunning = 3,
  kDecryptAttemptButTpmKeyMissing = 4,
  kDecryptAttemptButTpmNotOwned = 5,
  kDecryptAttemptButTpmNotAvailable = 6,
  kDecryptAttemptButTpmKeyMismatch = 7,
  kDecryptAttemptWithTpmKeyFailed = 8,
  kCannotLoadTpmSrk = 9,
  kCannotReadTpmSrkPublic = 10,
  kCannotLoadTpmKey = 11,
  kCannotReadTpmPublicKey = 12,
  kTpmBadKeyProperty = 13,
  kLoadPkcs11TokenFailed = 14,
  kEncryptWithTpmFailed = 15,
  kTssCommunicationFailure = 16,
  kTssInvalidHandle = 17,
  kBothTpmAndScryptWrappedKeyset = 18,
  kEphemeralCleanUpFailed = 19,
  kTpmOutOfMemory = 20,
  kCryptohomeErrorNumBuckets  // Must be the last entry.
};

// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum TimerType {
  kAsyncMountTimer = 0,       // Unused.
  kSyncMountTimer = 1,        // Unused.
  kAsyncGuestMountTimer = 2,  // Unused.
  kSyncGuestMountTimer = 3,   // Unused.
  kTpmTakeOwnershipTimer = 4,
  kPkcs11InitTimer = 5,
  kMountExTimer = 6,
  kDircryptoMigrationTimer = 7,
  kDircryptoMinimalMigrationTimer = 8,
  kOOPMountOperationTimer = 9,  // Obsolete.
  kOOPMountCleanupTimer = 10,   // Obsolete.
  kSessionUnlockTimer = 11,
  kMountGuestExTimer = 12,
  kPerformEphemeralMountTimer = 13,
  kPerformMountTimer = 14,
  kGenerateEccAuthValueTimer = 15,
  kAuthSessionAddCredentialsTimer = 16,  // Obsolete.
  kAuthSessionAddAuthFactorVKTimer = 17,
  kAuthSessionAddAuthFactorUSSTimer = 18,
  kAuthSessionAuthenticateTimer = 19,
  kAuthSessionAuthenticateAuthFactorVKTimer = 20,
  kAuthSessionAuthenticateAuthFactorUSSTimer = 21,
  kAuthSessionUpdateCredentialsTimer = 22,  // Obsolete.
  kAuthSessionUpdateAuthFactorVKTimer = 23,
  kAuthSessionUpdateAuthFactorUSSTimer = 24,
  kAuthSessionRemoveAuthFactorVKTimer = 25,
  kAuthSessionRemoveAuthFactorUSSTimer = 26,
  kCreatePersistentUserTimer = 27,
  kAuthSessionTotalLifetimeTimer = 28,
  kAuthSessionAuthenticatedLifetimeTimer = 29,
  kUSSPersistTimer = 30,
  kUSSLoadPersistedTimer = 31,
  kUSSMigrationTimer = 32,
  kNumTimerTypes  // For the number of timer types.
};

// Struct for recording metrics on how long certain AuthSession operations take.
struct AuthSessionPerformanceTimer {
  TimerType type;
  base::TimeTicks start_time;
  AuthBlockType auth_block_type;

  explicit AuthSessionPerformanceTimer(TimerType init_type)
      : type(init_type),
        start_time(base::TimeTicks::Now()),
        auth_block_type(AuthBlockType::kMaxValue) {}
  AuthSessionPerformanceTimer(TimerType init_type,
                              AuthBlockType init_auth_block_type)
      : type(init_type),
        start_time(base::TimeTicks::Now()),
        auth_block_type(init_auth_block_type) {}
};

// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum DircryptoMigrationFailedPathType {
  kMigrationFailedUnderOther = 1,
  kMigrationFailedUnderAndroidOther = 2,
  kMigrationFailedUnderAndroidCache = 3,
  kMigrationFailedUnderDownloads = 4,
  kMigrationFailedUnderCache = 5,
  kMigrationFailedUnderGcache = 6,
  kMigrationFailedPathTypeNumBuckets
};

// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class HomedirEncryptionType {
  kEcryptfs = 1,
  kDircrypto = 2,
  kDmcrypt = 3,
  kHomedirEncryptionTypeNumBuckets
};

// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class DiskCleanupProgress {
  kEphemeralUserProfilesCleaned = 1,
  kBrowserCacheCleanedAboveTarget = 2,
  kGoogleDriveCacheCleanedAboveTarget = 3,
  kGoogleDriveCacheCleanedAboveMinimum = 4,
  kAndroidCacheCleanedAboveTarget = 5,
  kAndroidCacheCleanedAboveMinimum = 6,
  kWholeUserProfilesCleanedAboveTarget = 7,
  kWholeUserProfilesCleaned = 8,
  kNoUnmountedCryptohomes = 9,
  kCacheVaultsCleanedAboveTarget = 10,
  kCacheVaultsCleanedAboveMinimum = 11,
  kNumBuckets
};

// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class LoginDiskCleanupProgress {
  kWholeUserProfilesCleanedAboveTarget = 1,
  kWholeUserProfilesCleaned = 2,
  kNoUnmountedCryptohomes = 3,
  kNumBuckets
};

// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class DiskCleanupResult {
  kDiskCleanupSuccess = 1,
  kDiskCleanupError = 2,
  kDiskCleanupSkip = 3,
  kNumBuckets
};

// List of the possible results of attempting a mount operation using the
// out-of-process mount helper.
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class OOPMountOperationResult {
  kSuccess = 0,
  kFailedToStart = 1,
  kFailedToWriteRequestProtobuf = 2,
  kHelperProcessTimedOut = 3,
  kFailedToReadResponseProtobuf = 4,
  kMaxValue = kFailedToReadResponseProtobuf
};

// List of the possible results of attempting an unmount/mount clean-up
// using the out-of-process mount helper.
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class OOPMountCleanupResult {
  kSuccess = 0,
  kFailedToPoke = 1,
  kFailedToWait = 2,
  kFailedToKill = 3,
  kMaxValue = kFailedToKill
};

// List of possible results from migrating the files at ~/MyFiles to
// ~/MyFiles/Downloads. These values are persisted to logs. Entries should not
// be renumbered and numeric values should never be reused.
enum class DownloadsBindMountMigrationStatus {
  kSuccess = 0,
  kSettingMigratedPreviouslyFailed = 1,
  kUpdatingXattrFailed = 2,
  kCleanupFailed = 3,
  kBackupFailed = 4,
  kRestoreFailed = 5,
  kFailedMovingToMyFiles = 6,
  kFailedSettingMigratedXattr = 7,
  kMaxValue = kFailedMovingToMyFiles
};

// Cros events emitted by cryptohome.
const char kAttestationOriginSpecificIdentifiersExhausted[] =
    "Attestation.OriginSpecificExhausted";
const char kCryptohomeDoubleMount[] = "Cryptohome.DoubleMountRequest";

// Constants related to LE Credential UMA logging.
inline constexpr char kLEOpResetTree[] = ".ResetTree";
inline constexpr char kLEOpInsert[] = ".Insert";
inline constexpr char kLEOpInsertRateLimiter[] = ".InsertRateLimiter";
inline constexpr char kLEOpCheck[] = ".Check";
inline constexpr char kLEOpReset[] = ".Reset";
inline constexpr char kLEOpRemove[] = ".Remove";
inline constexpr char kLEOpStartBiometricsAuth[] = ".StartBiometricsAuth";
inline constexpr char kLEOpSync[] = ".Sync";
inline constexpr char kLEOpGetDelayInSeconds[] = ".GetDelayInSeconds";
inline constexpr char kLEOpGetExpirationInSeconds[] = ".GetExpirationInSeconds";
inline constexpr char kLEOpReplay[] = ".Replay";
inline constexpr char kLEOpReplayResetTree[] = ".ReplayResetTree";
inline constexpr char kLEOpReplayInsert[] = ".ReplayInsert";
inline constexpr char kLEOpReplayCheck[] = ".ReplayCheck";
inline constexpr char kLEOpReplayRemove[] = ".ReplayRemove";
inline constexpr char kLEActionLoadFromDisk[] = ".LoadFromDisk";
inline constexpr char kLEActionBackend[] = ".Backend";
inline constexpr char kLEActionSaveToDisk[] = ".SaveToDisk";
inline constexpr char kLEActionBackendGetLog[] = ".BackendGetLog";
inline constexpr char kLEActionBackendReplayLog[] = ".BackendReplayLog";
inline constexpr char kLEActionBackendReplayLogForFullReplay[] =
    ".BackendReplayLogForFullReplay";
inline constexpr char kLEActionBackendRecoverInsert[] = ".BackendRecoverInsert";
inline constexpr char kLEReplayTypeNormal[] = ".Normal";
inline constexpr char kLEReplayTypeFull[] = ".Full";

// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class LEReplayError {
  kSuccess = 0,
  kInvalidLogEntry = 1,
  kOperationError = 2,
  kHashMismatch = 3,
  kRemoveInsertedCredentialsError = 4,
  kMaxValue,
};

// Various counts for ReportVaultKeysetMetrics.
struct VaultKeysetMetrics {
  int missing_key_data_count = 0;
  int empty_label_count = 0;
  int empty_label_le_cred_count = 0;
  int le_cred_count = 0;
  int untyped_count = 0;
  int password_count = 0;
  int smart_unlock_count = 0;
  int smartcard_count = 0;
  int fingerprint_count = 0;
  int kiosk_count = 0;
  int unclassified_count = 0;
};

// List of all the legacy code paths' usage we are tracking. This will enable us
// to further clean up the code in the future, should any of these code paths
// are found not being used.
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class LegacyCodePathLocation {
  // When a new keyset is being added, Cryptohome checks to see if the keyset
  // that authorizes that add keyset action has a reset_seed.
  // The goal of this block was to support pin, when the older keyset didn't
  // have reset_seed. In the newer versions of keyset, by default, we store a
  // reset_seed.
  kGenerateResetSeedDuringAddKey = 0,
  kMaxValue = kGenerateResetSeedDuringAddKey
};

inline constexpr char kCryptohomeErrorHashedStack[] =
    "Cryptohome.Error.HashedStack";
inline constexpr char kCryptohomeErrorLeafWithoutTPM[] =
    "Cryptohome.Error.LeafErrorWithoutTPM";
inline constexpr char kCryptohomeErrorLeafWithTPM[] =
    "Cryptohome.Error.LeafErrorWithTPM";
inline constexpr char kCryptohomeErrorDevCheckUnexpectedState[] =
    "Cryptohome.Error.DevUnexpectedState";
inline constexpr char kCryptohomeErrorAllLocations[] =
    "Cryptohome.Error.AllLocations";

// List of possible results of fetching the USS experiment config. If fetching
// failed, the status is kFetchError. If parsing failed, the status is
// kParseError.
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class FetchUssExperimentConfigStatus {
  kEnabled = 0,
  kDisabled = 1,
  // kError = 2, // no longer used, separated into kFetchError and kParseError
  kFetchError = 3,
  kParseError = 4,
  kNoReleaseTrack = 5,
  kMaxValue,
};

// List of possible results when AuthSession checks whether USS experiment
// should be enabled. This reports the normal case, which is the flag set by the
// config fetcher. If the enable/disable behavior is overridden this will not be
// reported. kNotFound means that the config fetching failed or haven't
// completed by the time AuthSession checks the flag.
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class UssExperimentFlag {
  kEnabled = 0,
  kDisabled = 1,
  kNotFound = 2,
  kMaxValue,
};

// List of possible auth factor backing store configurations that a user can
// have. This is determined by whether a user's factors are stored in vault
// keysets or the USS.
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class AuthFactorBackingStoreConfig {
  kEmpty = 0,            // User has no auth factors.
  kVaultKeyset = 1,      // All factors are stored in vault keysets.
  kUserSecretStash = 2,  // All factors are stored in the user secret stash.
  kMixed = 3,            // Factors are stoed in a mix of backings stores.
  kMaxValue = kMixed,
};

// List of errors from migrating a vault keyset to USS (or success=0). This enum
// should be updated with any new errors that can occur, along with enums.xml.
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class VkToUssMigrationStatus {
  kSuccess = 0,                      // Migration succeeded with no errors.
  kFailedPersist = 1,                // Migration failed when persisting to USS.
  kFailedInput = 2,                  // Unable to construct an AuthInput.
  kFailedUssCreation = 3,            // Unable to construct USS.
  kFailedAddingMigrationSecret = 4,  // Unable to construct a migration secret.
  kFailedUssDecrypt = 5,             // Unable to decrypt USS.
  kFailedRecordingMigrated = 6,      // Unable to store migrated state.
  kMaxValue = kFailedRecordingMigrated,
};

// Initializes cryptohome metrics. If this is not called, all calls to Report*
// will have no effect.
void InitializeMetrics();

// Cleans up and returns cryptohome metrics to an uninitialized state.
void TearDownMetrics();

// Override the internally used MetricsLibrary for testing purpose.
void OverrideMetricsLibraryForTesting(MetricsLibraryInterface* lib);

// Reset the internally used MetricsLibrary for testing purpose. This is usually
// used with OverrideMetricsLibraryForTesting().
void ClearMetricsLibraryForTesting();

// The |error| value is reported to the "Cryptohome.Errors" enum histogram.
void ReportCryptohomeError(CryptohomeErrorMetric error);

// Cros events are translated to an enum and reported to the generic
// "Platform.CrOSEvent" enum histogram. The |event| string must be registered in
// metrics/metrics_library.cc:kCrosEventNames.
void ReportCrosEvent(const char* event);

// Starts a timer for the given |timer_type|.
void ReportTimerStart(TimerType timer_type);

// Stops a timer and reports in milliseconds. Timers are reported to the
// "Cryptohome.TimeTo*" histograms.
void ReportTimerStop(TimerType timer_type);

// Reports a timer length in milliseconds, duration is calculated by the time it
// is called minus the start_time of the reported timer.
void ReportTimerDuration(
    const AuthSessionPerformanceTimer* auth_session_performance_timer);

void ReportTimerDuration(const TimerType& timer_type,
                         base::TimeTicks start_time,
                         const std::string& parameter_string);

// Reports the result of credentials revocation for `auth_block_type` to the
// "Cryptohome.{AuthBlockType}.CredentialRevocationResult" histogram.
void ReportCredentialRevocationResult(AuthBlockType auth_block_type,
                                      LECredError result);

// Reports number of deleted user profiles to the
// "Cryptohome.DeletedUserProfiles" histogram.
void ReportDeletedUserProfiles(int user_profile_count);

// Reports total time taken by HomeDirs::FreeDiskSpace cleanup (milliseconds) to
// the "Cryptohome.FreeDiskSpaceTotalTime" histogram.
void ReportFreeDiskSpaceTotalTime(int ms);

// Reports total space freed by HomeDirs::FreeDiskSpace (in MiB) to
// the "Cryptohome.FreeDiskSpaceTotalFreedInMb" histogram.
void ReportFreeDiskSpaceTotalFreedInMb(int mb);

// Reports the time between HomeDirs::FreeDiskSpace cleanup calls (seconds) to
// the "Cryptohome.TimeBetweenFreeDiskSpace" histogram.
void ReportTimeBetweenFreeDiskSpace(int s);

// Reports removed GCache size by cryptohome to the
// "Cryptohome.GCache.FreedDiskSpaceInMb" histogram.
void ReportFreedGCacheDiskSpaceInMb(int mb);

// Reports removed Cache Vault size by cryptohome to the
// "Cryptohome.FreedCacheVaultDiskSpaceInMb" histogram.
void ReportFreedCacheVaultDiskSpaceInMb(int mb);

// Reports total time taken by HomeDirs::FreeDiskSpaceDuringLogin cleanup
// (milliseconds) to the "Cryptohome.LoginDiskCleanupTotalTime" histogram.
void ReportLoginDiskCleanupTotalTime(int ms);

// Reports total space freed by HomeDirs::FreeDiskSpaceDuringLogin (in MiB) to
// the "Cryptohome.FreeDiskSpaceDuringLoginTotalFreedInMb" histogram.
void ReportFreeDiskSpaceDuringLoginTotalFreedInMb(int mb);

// The |status| value is reported to the
// "Cryptohome.DircryptoMigrationStartStatus" (full migration)
// or the "Cryptohome.DircryptoMinimalMigrationStartStatus" (minimal migration)
// enum histogram.
void ReportDircryptoMigrationStartStatus(
    MigrationType migration_type, data_migrator::MigrationStartStatus status);

// The |status| value is reported to the
// "Cryptohome.DircryptoMigrationEndStatus" (full migration)
// or the "Cryptohome.DircryptoMinimalMigrationEndStatus" (minimal migration)
// enum histogram.
void ReportDircryptoMigrationEndStatus(
    MigrationType migration_type, data_migrator::MigrationEndStatus status);

// The |error_code| value is reported to the
// "Cryptohome.DircryptoMigrationFailedErrorCode"
// enum histogram.
void ReportDircryptoMigrationFailedErrorCode(base::File::Error error_code);

// The |type| value is reported to the
// "Cryptohome.DircryptoMigrationFailedOperationType"
// enum histogram.
void ReportDircryptoMigrationFailedOperationType(
    data_migrator::MigrationFailedOperationType type);

// The |type| value is reported to the
// "Cryptohome.DircryptoMigrationFailedPathType"
// enum histogram.
void ReportDircryptoMigrationFailedPathType(
    DircryptoMigrationFailedPathType type);

// Reports the total byte count in MB to migrate to the
// "Cryptohome.DircryptoMigrationTotalByteCountInMb" histogram.
void ReportDircryptoMigrationTotalByteCountInMb(int total_byte_count_mb);

// Reports the total file count to migrate to the
// "Cryptohome.DircryptoMigrationTotalFileCount" histogram.
void ReportDircryptoMigrationTotalFileCount(int total_file_count);

// Reports which topmost priority was reached to fulfill a cleanup request
// to the "Cryptohome.DiskCleanupProgress" enum histogram.
void ReportDiskCleanupProgress(DiskCleanupProgress progress);

// Report if the automatic disk cleanup encountered an error to the
// "Cryptohome.DiskCleanupResult" enum histogram.
void ReportDiskCleanupResult(DiskCleanupResult result);

// Reports which topmost priority was reached to fulfill a cleanup request
// to the "Cryptohome.LoginDiskCleanupProgress" enum histogram.
void ReportLoginDiskCleanupProgress(LoginDiskCleanupProgress progress);

// Report if the automatic disk cleanup encountered an error to the
// "Cryptohome.LoginDiskCleanupResult" enum histogram.
void ReportLoginDiskCleanupResult(DiskCleanupResult result);

// The |type| value is reported to the "Cryptohome.HomedirEncryptionType" enum
// histogram.
void ReportHomedirEncryptionType(HomedirEncryptionType type);

// Reports the number of user directories present in the system.
void ReportNumUserHomeDirectories(int num_users);

// Reports the result of a Low Entropy (LE) Credential operation to the relevant
// LE Credential histogram.
void ReportLEResult(const char* type, const char* action, LECredError result);

// Reports the overall outcome of a Low Entropy (LE) Credential Sync operation
// to the "Cryptohome.LECredential.SyncOutcome" enum histogram.
void ReportLESyncOutcome(LECredError result);

// Reports the number of log entries attempted to replay during an LE log replay
// operation. This count is one-based, zero is used as a sentinel value for "all
// entries", reported when none of the log entries matches the root hash.
void ReportLELogReplayEntryCount(size_t entry_count);

// Reports the log entries replay result. We didn't reuse the LECredError here
// because the error possibilities are quite different. We separate the
// results between a normal replay and a full replay because the error
// distribution in a full replay might be very different (since we're just doing
// a best-effort attempt hoping that we are only 1 entry behind the first log
// entry).
void ReportLEReplayResult(bool is_full_replay, LEReplayError result);

// Reports the free space in MB when the migration fails and what the free space
// was initially when the migration was started.
void ReportDircryptoMigrationFailedNoSpace(int initial_migration_free_space_mb,
                                           int failure_free_space_mb);

// Reports the total size in bytes of the current xattrs already set on a file
// and the xattr that caused the setxattr call to fail.
void ReportDircryptoMigrationFailedNoSpaceXattrSizeInBytes(
    int total_xattr_size_bytes);

// Reports the amount of total tasks waiting in the queue of mount thread.
void ReportParallelTasks(int amount_of_task);

// Reports the result of an out-of-process mount operation.
void ReportOOPMountOperationResult(OOPMountOperationResult result);

// Reports the result of an out-of-process cleanup operation.
void ReportOOPMountCleanupResult(OOPMountCleanupResult result);

// Reports the result of PrepareForRemoval() for `auth_block_type`
// to the "Cryptohome.{AuthBlockType}.PrepareForRemovalResult" histogram.
void ReportPrepareForRemovalResult(AuthBlockType auth_block_type,
                                   CryptoError result);

// Reports the result of a RestoreSELinuxContexts operation for /home/.shadow.
void ReportRestoreSELinuxContextResultForShadowDir(bool success);

// Reports the result of a RestoreSELinuxContexts operation for the bind mounted
// directories under user home directory.
void ReportRestoreSELinuxContextResultForHomeDir(bool success);

// Reports which kinds of auth block we are used to derive.
void ReportCreateAuthBlock(AuthBlockType type);

// Reports which kinds of auth block we are used to derive.
void ReportDeriveAuthBlock(AuthBlockType type);

// Reports which code paths are being used today and performing what actions.
void ReportUsageOfLegacyCodePath(LegacyCodePathLocation location, bool result);

// Reports certain metrics around VaultKeyset such as the number of empty
// labels, the number of smart unlock keys, number of password keys with and
// without KeyProviderData, and the number of labeled/label-less PIN
// VaultKeysets.
void ReportVaultKeysetMetrics(const VaultKeysetMetrics& keyset_metrics);

// Reports number of files that exist in ~/MyFiles/Downloads prior to migrating
// and bind mounting. This only records the top-level items but does not record
// items in sub-directories.
void ReportMaskedDownloadsItems(int num_items);

// Reports the overall status after attempting to migrate a user's ~/Downloads
// to ~/MyFiles/Downloads.
void ReportDownloadsBindMountMigrationStatus(
    DownloadsBindMountMigrationStatus status);

// Cryptohome Error Reporting related UMAs

// Reports the full error id's hash when an error occurred.
void ReportCryptohomeErrorHashedStack(const uint32_t hashed);

// Reports the leaf node of an error id when an error occurred.
void ReportCryptohomeErrorLeaf(const uint32_t node);

// Reports the leaf node and TPM error when an error occurred.
void ReportCryptohomeErrorLeafWithTPM(const uint32_t mixed);

// Reports the error location when kDevCheckUnexpectedState happened.
void ReportCryptohomeErrorDevCheckUnexpectedState(const uint32_t loc);

// Reports a node in the error ID. This will be called multiple times for
// an error ID with multiple nodes.
void ReportCryptohomeErrorAllLocations(const uint32_t loc);

// Call this to disable all CryptohomeError related metrics reporting. This is
// for situations in which we generate too many possible values in
// CryptohomeError related reporting.
void DisableErrorMetricsReporting();

// Reports the result of fetching the USS experiment config.
void ReportFetchUssExperimentConfigStatus(
    FetchUssExperimentConfigStatus status);

// Reports the number of retries when fetching the USS experiment config.
void ReportFetchUssExperimentConfigRetries(int retries);

// Reports the result of reading the USS experiment flag.
void ReportUssExperimentFlag(UssExperimentFlag flag);

// Reports the current state of the auth factor backing stores.
void ReportAuthFactorBackingStoreConfig(AuthFactorBackingStoreConfig config);

// Reports the result of an (attempted) migration of a keyset to USS.
void ReportVkToUssMigrationStatus(VkToUssMigrationStatus status);

// Initialization helper.
class ScopedMetricsInitializer {
 public:
  ScopedMetricsInitializer() { InitializeMetrics(); }
  ~ScopedMetricsInitializer() { TearDownMetrics(); }
};

}  // namespace cryptohome

#endif  // CRYPTOHOME_CRYPTOHOME_METRICS_H_