xds: Remove unused opencensus-proto dependency

opencensus-proto is old generated code, which is not compatible with
protobuf-java 4.27.2 and may not be fixed since the project is dead.
Since it is unused, I think this doesn't cause any trouble for
downstream users trying to use protobuf-java 4.x. Related to #11015.

gradle/libs.versions.toml

@@ -75,7 +75,6 @@ opencensus-contrib-grpc-metrics = { module = "io.opencensus:opencensus-contrib-g
 opencensus-exporter-stats-stackdriver = { module = "io.opencensus:opencensus-exporter-stats-stackdriver", version.ref = "opencensus" }
 opencensus-exporter-trace-stackdriver = { module = "io.opencensus:opencensus-exporter-trace-stackdriver", version.ref = "opencensus" }
 opencensus-impl = { module = "io.opencensus:opencensus-impl", version.ref = "opencensus" }
-opencensus-proto = "io.opencensus:opencensus-proto:0.2.0"
 opentelemetry-api = "io.opentelemetry:opentelemetry-api:1.39.0"
 opentelemetry-exporter-prometheus = "io.opentelemetry:opentelemetry-exporter-prometheus:1.39.0-alpha"
 opentelemetry-gcp-resources = "io.opentelemetry.contrib:opentelemetry-gcp-resources:1.36.0-alpha"

xds/build.gradle

@@ -43,8 +43,7 @@ configurations {
 dependencies {
     thirdpartyCompileOnly libraries.javax.annotation
     thirdpartyImplementation project(':grpc-protobuf'),
-            project(':grpc-stub'),
+            project(':grpc-stub')
-            libraries.opencensus.proto
     compileOnly sourceSets.thirdparty.output
     implementation project(':grpc-stub'),
             project(':grpc-core'),

xds/third_party/envoy/import.sh

@@ -67,10 +67,8 @@ envoy/config/trace/v3/datadog.proto
 envoy/config/trace/v3/dynamic_ot.proto
 envoy/config/trace/v3/http_tracer.proto
 envoy/config/trace/v3/lightstep.proto
-envoy/config/trace/v3/opencensus.proto
 envoy/config/trace/v3/opentelemetry.proto
 envoy/config/trace/v3/service.proto
-envoy/config/trace/v3/trace.proto
 envoy/config/trace/v3/zipkin.proto
 envoy/data/accesslog/v3/accesslog.proto
 envoy/extensions/clusters/aggregate/v3/cluster.proto

xds/third_party/envoy/src/main/proto/envoy/config/trace/v3/opencensus.proto

@@ -1,117 +0,0 @@
-syntax = "proto3";
-
-package envoy.config.trace.v3;
-
-import "envoy/config/core/v3/grpc_service.proto";
-
-import "opencensus/proto/trace/v1/trace_config.proto";
-
-import "envoy/annotations/deprecation.proto";
-import "udpa/annotations/migrate.proto";
-import "udpa/annotations/status.proto";
-import "udpa/annotations/versioning.proto";
-
-option java_package = "io.envoyproxy.envoy.config.trace.v3";
-option java_outer_classname = "OpencensusProto";
-option java_multiple_files = true;
-option go_package = "github.com/envoyproxy/go-control-plane/envoy/config/trace/v3;tracev3";
-option (udpa.annotations.file_migrate).move_to_package =
-    "envoy.extensions.tracers.opencensus.v4alpha";
-option (udpa.annotations.file_status).package_version_status = ACTIVE;
-
-// [#protodoc-title: OpenCensus tracer]
-
-// Configuration for the OpenCensus tracer.
-// [#next-free-field: 15]
-// [#extension: envoy.tracers.opencensus]
-message OpenCensusConfig {
-  option (udpa.annotations.versioning).previous_message_type =
-      "envoy.config.trace.v2.OpenCensusConfig";
-
-  enum TraceContext {
-    // No-op default, no trace context is utilized.
-    NONE = 0;
-
-    // W3C Trace-Context format "traceparent:" header.
-    TRACE_CONTEXT = 1;
-
-    // Binary "grpc-trace-bin:" header.
-    GRPC_TRACE_BIN = 2;
-
-    // "X-Cloud-Trace-Context:" header.
-    CLOUD_TRACE_CONTEXT = 3;
-
-    // X-B3-* headers.
-    B3 = 4;
-  }
-
-  reserved 7;
-
-  // Configures tracing, e.g. the sampler, max number of annotations, etc.
-  opencensus.proto.trace.v1.TraceConfig trace_config = 1
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // Enables the stdout exporter if set to true. This is intended for debugging
-  // purposes.
-  bool stdout_exporter_enabled = 2
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // Enables the Stackdriver exporter if set to true. The project_id must also
-  // be set.
-  bool stackdriver_exporter_enabled = 3
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // The Cloud project_id to use for Stackdriver tracing.
-  string stackdriver_project_id = 4
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // (optional) By default, the Stackdriver exporter will connect to production
-  // Stackdriver. If stackdriver_address is non-empty, it will instead connect
-  // to this address, which is in the gRPC format:
-  // https://github.com/grpc/grpc/blob/master/doc/naming.md
-  string stackdriver_address = 10
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // (optional) The gRPC server that hosts Stackdriver tracing service. Only
-  // Google gRPC is supported. If :ref:`target_uri <envoy_v3_api_field_config.core.v3.GrpcService.GoogleGrpc.target_uri>`
-  // is not provided, the default production Stackdriver address will be used.
-  core.v3.GrpcService stackdriver_grpc_service = 13
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // Enables the Zipkin exporter if set to true. The url and service name must
-  // also be set. This is deprecated, prefer to use Envoy's :ref:`native Zipkin
-  // tracer <envoy_v3_api_msg_config.trace.v3.ZipkinConfig>`.
-  bool zipkin_exporter_enabled = 5
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // The URL to Zipkin, e.g. "http://127.0.0.1:9411/api/v2/spans". This is
-  // deprecated, prefer to use Envoy's :ref:`native Zipkin tracer
-  // <envoy_v3_api_msg_config.trace.v3.ZipkinConfig>`.
-  string zipkin_url = 6
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // Enables the OpenCensus Agent exporter if set to true. The ocagent_address or
-  // ocagent_grpc_service must also be set.
-  bool ocagent_exporter_enabled = 11
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // The address of the OpenCensus Agent, if its exporter is enabled, in gRPC
-  // format: https://github.com/grpc/grpc/blob/master/doc/naming.md
-  // [#comment:TODO: deprecate this field]
-  string ocagent_address = 12
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // (optional) The gRPC server hosted by the OpenCensus Agent. Only Google gRPC is supported.
-  // This is only used if the ocagent_address is left empty.
-  core.v3.GrpcService ocagent_grpc_service = 14
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // List of incoming trace context headers we will accept. First one found
-  // wins.
-  repeated TraceContext incoming_trace_context = 8
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-
-  // List of outgoing trace context headers we will produce.
-  repeated TraceContext outgoing_trace_context = 9
-      [deprecated = true, (envoy.annotations.deprecated_at_minor_version) = "3.0"];
-}

xds/third_party/envoy/src/main/proto/envoy/config/trace/v3/trace.proto

@@ -1,17 +0,0 @@
-syntax = "proto3";
-
-package envoy.config.trace.v3;
-
-import public "envoy/config/trace/v3/datadog.proto";
-import public "envoy/config/trace/v3/dynamic_ot.proto";
-import public "envoy/config/trace/v3/http_tracer.proto";
-import public "envoy/config/trace/v3/lightstep.proto";
-import public "envoy/config/trace/v3/opencensus.proto";
-import public "envoy/config/trace/v3/opentelemetry.proto";
-import public "envoy/config/trace/v3/service.proto";
-import public "envoy/config/trace/v3/zipkin.proto";
-
-option java_package = "io.envoyproxy.envoy.config.trace.v3";
-option java_outer_classname = "TraceProto";
-option java_multiple_files = true;
-option go_package = "github.com/envoyproxy/go-control-plane/envoy/config/trace/v3;tracev3";