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+/*
+ *  Copyright 2014 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// This file contains enums related to Chrome UMA histograms. See
+// https://chromium.googlesource.com/chromium/src.git/+/HEAD/tools/metrics/histograms/README.md#requirements
+// for requirements when adding or changing metrics.
+
+#ifndef API_UMA_METRICS_H_
+#define API_UMA_METRICS_H_
+
+namespace webrtc {
+
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum PeerConnectionAddressFamilyCounter {
+  kPeerConnection_IPv4 = 0,
+  kPeerConnection_IPv6 = 1,
+  kBestConnections_IPv4 = 2,
+  kBestConnections_IPv6 = 3,
+  kPeerConnectionAddressFamilyCounter_Max
+};
+
+// This enum defines types for UMA samples, which will have a range.
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum PeerConnectionMetricsName {
+  kNetworkInterfaces_IPv4 = 0,  // Number of IPv4 interfaces.
+  kNetworkInterfaces_IPv6 = 1,  // Number of IPv6 interfaces.
+  kTimeToConnect = 2,           // In milliseconds.
+  kLocalCandidates_IPv4 = 3,    // Number of IPv4 local candidates.
+  kLocalCandidates_IPv6 = 4,    // Number of IPv6 local candidates.
+  kPeerConnectionMetricsName_Max
+};
+
+// The IceCandidatePairType has the format of
+// <local_candidate_type>_<remote_candidate_type>. It is recorded based on the
+// type of candidate pair used when the PeerConnection first goes to a completed
+// state. When BUNDLE is enabled, only the first transport gets recorded.
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum IceCandidatePairType {
+  // HostHost is deprecated. It was replaced with the set of types at the bottom
+  // to report private or public host IP address.
+  kIceCandidatePairHostHost = 0,
+  kIceCandidatePairHostSrflx = 1,
+  kIceCandidatePairHostRelay = 2,
+  kIceCandidatePairHostPrflx = 3,
+  kIceCandidatePairSrflxHost = 4,
+  kIceCandidatePairSrflxSrflx = 5,
+  kIceCandidatePairSrflxRelay = 6,
+  kIceCandidatePairSrflxPrflx = 7,
+  kIceCandidatePairRelayHost = 8,
+  kIceCandidatePairRelaySrflx = 9,
+  kIceCandidatePairRelayRelay = 10,
+  kIceCandidatePairRelayPrflx = 11,
+  kIceCandidatePairPrflxHost = 12,
+  kIceCandidatePairPrflxSrflx = 13,
+  kIceCandidatePairPrflxRelay = 14,
+
+  // The following 9 types tell whether local and remote hosts have hostname,
+  // private or public IP addresses.
+  kIceCandidatePairHostPrivateHostPrivate = 15,
+  kIceCandidatePairHostPrivateHostPublic = 16,
+  kIceCandidatePairHostPublicHostPrivate = 17,
+  kIceCandidatePairHostPublicHostPublic = 18,
+  kIceCandidatePairHostNameHostName = 19,
+  kIceCandidatePairHostNameHostPrivate = 20,
+  kIceCandidatePairHostNameHostPublic = 21,
+  kIceCandidatePairHostPrivateHostName = 22,
+  kIceCandidatePairHostPublicHostName = 23,
+  kIceCandidatePairMax
+};
+
+// The difference between PeerConnectionEnumCounter and
+// PeerConnectionMetricsName is that the "EnumCounter" is only counting the
+// occurrences of events, while "Name" has a value associated with it which is
+// used to form a histogram.
+
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum KeyExchangeProtocolMedia {
+  kEnumCounterKeyProtocolMediaTypeDtlsAudio = 0,
+  kEnumCounterKeyProtocolMediaTypeDtlsVideo = 1,
+  kEnumCounterKeyProtocolMediaTypeDtlsData = 2,
+  kEnumCounterKeyProtocolMediaTypeSdesAudio = 3,
+  kEnumCounterKeyProtocolMediaTypeSdesVideo = 4,
+  kEnumCounterKeyProtocolMediaTypeSdesData = 5,
+  kEnumCounterKeyProtocolMediaTypeMax
+};
+
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum SdpSemanticRequested {
+  kSdpSemanticRequestDefault = 0,
+  kSdpSemanticRequestPlanB = 1,
+  kSdpSemanticRequestUnifiedPlan = 2,
+  kSdpSemanticRequestMax
+};
+
+// Metric for counting the outcome of adding an ICE candidate
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum AddIceCandidateResult {
+  kAddIceCandidateSuccess = 0,
+  kAddIceCandidateFailClosed = 1,
+  kAddIceCandidateFailNoRemoteDescription = 2,
+  kAddIceCandidateFailNullCandidate = 3,
+  kAddIceCandidateFailNotValid = 4,
+  kAddIceCandidateFailNotReady = 5,
+  kAddIceCandidateFailInAddition = 6,
+  kAddIceCandidateFailNotUsable = 7,
+  kAddIceCandidateMax
+};
+
+// Metric for recording which api surface was used to enable simulcast.
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum SimulcastApiVersion {
+  kSimulcastApiVersionNone = 0,
+  kSimulcastApiVersionLegacy = 1,
+  kSimulcastApiVersionSpecCompliant = 2,
+  kSimulcastApiVersionMax
+};
+
+// Metrics for reporting usage of BUNDLE.
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum BundleUsage {
+  // There are no m-lines in the SDP, only a session description.
+  kBundleUsageEmpty = 0,
+  // Only a data channel is negotiated but BUNDLE is not negotiated.
+  kBundleUsageNoBundleDatachannelOnly = 1,
+  // BUNDLE is not negotiated and there is at most one m-line per media type,
+  kBundleUsageNoBundleSimple = 2,
+  // BUNDLE is not negotiated and there are multiple m-lines per media type,
+  kBundleUsageNoBundleComplex = 3,
+  // Only a data channel is negotiated and BUNDLE is negotiated.
+  kBundleUsageBundleDatachannelOnly = 4,
+  // BUNDLE is negotiated but there is at most one m-line per media type,
+  kBundleUsageBundleSimple = 5,
+  // BUNDLE is negotiated and there are multiple m-lines per media type,
+  kBundleUsageBundleComplex = 6,
+  // Legacy plan-b metrics.
+  kBundleUsageNoBundlePlanB = 7,
+  kBundleUsageBundlePlanB = 8,
+  kBundleUsageMax
+};
+
+// Metrics for reporting configured BUNDLE policy, mapping directly to
+// https://w3c.github.io/webrtc-pc/#rtcbundlepolicy-enum
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum BundlePolicyUsage {
+  kBundlePolicyUsageBalanced = 0,
+  kBundlePolicyUsageMaxBundle = 1,
+  kBundlePolicyUsageMaxCompat = 2,
+  kBundlePolicyUsageMax
+};
+
+// Metrics for provisional answers as described in
+// https://datatracker.ietf.org/doc/html/rfc8829#section-4.1.10.1
+// These values are persisted to logs. Entries should not be renumbered and
+// numeric values should never be reused.
+enum ProvisionalAnswerUsage {
+  kProvisionalAnswerNotUsed = 0,
+  kProvisionalAnswerLocal = 1,
+  kProvisionalAnswerRemote = 2,
+  kProvisionalAnswerMax
+};
+
+// Metrics for RTCRtpMuxPolicy. The only defined value is
+// https://w3c.github.io/webrtc-pc/#rtcrtcpmuxpolicy-enum
+// "require" but there is a legacy option "negotiate" which
+// was removed from the spec.
+enum RtcpMuxPolicyUsage {
+  kRtcpMuxPolicyUsageRequire = 0,
+  kRtcpMuxPolicyUsageNegotiate = 1,
+  kRtcpMuxPolicyUsageMax
+};
+
+// When adding new metrics please consider using the style described in
+// https://chromium.googlesource.com/chromium/src.git/+/HEAD/tools/metrics/histograms/README.md#usage
+// instead of the legacy enums used above.
+
+}  // namespace webrtc
+
+#endif  // API_UMA_METRICS_H_