Merge "Sync DoH relevants fields from atom.proto and dns_resolver.proto to...

    // The sample rate of DNS stats (to statsd) is 1/sampling_rate_denom.

    optional int32 sampling_rate_denom = 9;

}

enum HandshakeResult {

    HR_UNKNOWN = 0;

    HR_SUCCESS = 1;

    HR_TIMEOUT = 2;

    HR_TLS_FAIL = 3;

    HR_SERVER_UNREACHABLE = 4;

}

enum HandshakeCause {

    HC_UNKNOWN = 0;

    HC_SERVER_PROBE = 1;

    HC_RECONNECT_AFTER_IDLE = 2;

    HC_RETRY_AFTER_ERROR = 3;

}

/**

 * The NetworkDnsHandshakeReported message describes a DoT or DoH handshake operation along with

 * its result, cause, network latency, TLS version, etc.

 *

 */

message NetworkDnsHandshakeReported {

  optional Protocol protocol = 1;

  optional HandshakeResult result = 2;

  optional HandshakeCause cause = 3;

  optional NetworkType network_type = 4;

  optional PrivateDnsModes private_dns_mode = 5;

  // The latency in microseconds of the entire handshake operation.

  optional int32 latency_micros = 6;

  // Sent packets in bytes.

  optional int32 bytes_sent = 7;

  // Received packets in bytes.

  optional int32 bytes_received = 8;

  // Number of round-trips.

  optional int32 round_trips = 9;

  // True if TLS session cache hit.

  optional bool tls_session_cache_hit = 10;

  // 2 = TLS 1.2, 3 = TLS 1.3

  optional int32 tls_version = 11;

  // True if the handshake requires verifying the private DNS provider hostname.

  optional bool hostname_verification = 12;

  // Only present when protocol = PROTO_DOH.

  optional int32 quic_version = 13;

  optional int32 server_index = 14;

  // The sampling-rate of this event is 1/sampling_rate_denom.

  optional int32 sampling_rate_denom = 15;

}