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Akka gRPC - Support for building streaming gRPC servers and clients on top of Akka Streams.

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syntax = "proto3";

package envoy.config.trace.v2;

import "google/protobuf/wrappers.proto";

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

option java_package = "io.envoyproxy.envoy.config.trace.v2";
option java_outer_classname = "ZipkinProto";
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: Zipkin tracer]

// Configuration for the Zipkin tracer.
// [#extension: envoy.tracers.zipkin]
// [#next-free-field: 6]
message ZipkinConfig {
  // Available Zipkin collector endpoint versions.
  enum CollectorEndpointVersion {
    // Zipkin API v1, JSON over HTTP.
    // [#comment: The default implementation of Zipkin client before this field is added was only v1
    // and the way user configure this was by not explicitly specifying the version. Consequently,
    // before this is added, the corresponding Zipkin collector expected to receive v1 payload.
    // Hence the motivation of adding HTTP_JSON_V1 as the default is to avoid a breaking change when
    // user upgrading Envoy with this change. Furthermore, we also immediately deprecate this field,
    // since in Zipkin realm this v1 version is considered to be not preferable anymore.]
    HTTP_JSON_V1 = 0 [deprecated = true, (envoy.annotations.disallowed_by_default_enum) = true];

    // Zipkin API v2, JSON over HTTP.
    HTTP_JSON = 1;

    // Zipkin API v2, protobuf over HTTP.
    HTTP_PROTO = 2;

    // [#not-implemented-hide:]
    GRPC = 3;
  }

  // The cluster manager cluster that hosts the Zipkin collectors. Note that the
  // Zipkin cluster must be defined in the :ref:`Bootstrap static cluster
  // resources `.
  string collector_cluster = 1 [(validate.rules).string = {min_bytes: 1}];

  // The API endpoint of the Zipkin service where the spans will be sent. When
  // using a standard Zipkin installation, the API endpoint is typically
  // /api/v1/spans, which is the default value.
  string collector_endpoint = 2 [(validate.rules).string = {min_bytes: 1}];

  // Determines whether a 128bit trace id will be used when creating a new
  // trace instance. The default value is false, which will result in a 64 bit trace id being used.
  bool trace_id_128bit = 3;

  // Determines whether client and server spans will share the same span context.
  // The default value is true.
  google.protobuf.BoolValue shared_span_context = 4;

  // Determines the selected collector endpoint version. By default, the ``HTTP_JSON_V1`` will be
  // used.
  CollectorEndpointVersion collector_endpoint_version = 5;
}