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// Copyright 2016 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
syntax = "proto3";
package google.trace;
// Tracing information that is propagated with RPC's.
message TraceContext {
// A TraceId uniquely represents a single Trace. It is a 128-bit nonce.
// The 128-bit ID is split into 2 64-bit chunks. (REQUIRED)
fixed64 trace_id_hi = 1;
fixed64 trace_id_lo = 2;
// ID of parent (client) span. (REQUIRED)
fixed64 span_id = 3;
// Span option flags. First bit is true if this trace is sampled. (OPTIONAL)
fixed32 span_options = 4;
}
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