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There is a newer version: 1.0.46

syntax = "proto3";

package envoy.config.trace.v2;

import "udpa/annotations/status.proto";
import "validate/validate.proto";

option java_package = "io.envoyproxy.envoy.config.trace.v2";
option java_outer_classname = "LightstepProto";
option java_multiple_files = true;
option go_package = "github.com/envoyproxy/go-control-plane/envoy/config/trace/v2;tracev2";
option (udpa.annotations.file_status).package_version_status = FROZEN;

// [#protodoc-title: LightStep tracer]

// Configuration for the LightStep tracer.
// [#extension: envoy.tracers.lightstep]
message LightstepConfig {
  // Available propagation modes
  enum PropagationMode {
    // Propagate trace context in the single header x-ot-span-context.
    ENVOY = 0;

    // Propagate trace context using LightStep's native format.
    LIGHTSTEP = 1;

    // Propagate trace context using the b3 format.
    B3 = 2;

    // Propagation trace context using the w3 trace-context standard.
    TRACE_CONTEXT = 3;
  }

  // The cluster manager cluster that hosts the LightStep collectors.
  string collector_cluster = 1 [(validate.rules).string = {min_bytes: 1}];

  // File containing the access token to the `LightStep
  // `_ API.
  string access_token_file = 2 [(validate.rules).string = {min_bytes: 1}];

  // Propagation modes to use by LightStep's tracer.
  repeated PropagationMode propagation_modes = 3
      [(validate.rules).repeated = {items {enum {defined_only: true}}}];
}