span.proto

syntax = "proto3";

message Span {
    fixed64 traceID = 1;
    string spanID = 2;

    int64 time = 3;

    map<string, string> properties = 4;

    map<string, string> context = 5;

    message Transaction {
        int64 time = 1;

        enum Flag {
            CS = 0;
            CR = 1;
            SR = 2;
            SS = 3;
        }   
        Flag flag = 2;

        int32 duration = 3;

        enum Status {
            SUCCESS = 0;
            FAILED = 1;
        }
        Status status = 4;
    }

    Transaction transaction = 6;

    message Event {
        int64 time = 1;
        string type = 2;

        map<string, string> data = 3;
    }

    repeated Event events = 7;

    map<string, string> metrics = 8;

    message Annotation {
        map<string, string> sys = 1;
        map<string, string> usr = 2;
    }

    Annotation annotations = 9;
}