src/proto/census/trace_context.proto

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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;
}