stat_sinks: add OpenTelemetry stats sink (#26620)

Signed-off-by: ohadvano <ohadvano@gmail.com>

Mirrored from https://github.com/envoyproxy/envoy @ a6d46b6ac4750720eec9a49abe701f0df9bf8e0a

BUILD

@@ -286,6 +286,7 @@ proto_library(
         "//envoy/extensions/retry/host/previous_hosts/v3:pkg",
         "//envoy/extensions/retry/priority/previous_priorities/v3:pkg",
         "//envoy/extensions/stat_sinks/graphite_statsd/v3:pkg",
+        "//envoy/extensions/stat_sinks/open_telemetry/v3:pkg",
         "//envoy/extensions/stat_sinks/wasm/v3:pkg",
         "//envoy/extensions/transport_sockets/alts/v3:pkg",
         "//envoy/extensions/transport_sockets/http_11_proxy/v3:pkg",

bazel/external_proto_deps.bzl

@@ -34,6 +34,7 @@ EXTERNAL_PROTO_GO_BAZEL_DEP_MAP = {
     "@opencensus_proto//opencensus/proto/trace/v1:trace_config_proto": "@opencensus_proto//opencensus/proto/trace/v1:trace_and_config_proto_go",
     "@opentelemetry_proto//:trace": "@opentelemetry_proto//:trace_go_proto",
     "@opentelemetry_proto//:logs": "@opentelemetry_proto//:logs_go_proto",
+    "@opentelemetry_proto//:metrics": "@opentelemetry_proto//:metrics_go_proto",
     "@opentelemetry_proto//:common": "@opentelemetry_proto//:common_go_proto",
 }
 
@@ -45,6 +46,7 @@ EXTERNAL_PROTO_CC_BAZEL_DEP_MAP = {
     "@opencensus_proto//opencensus/proto/trace/v1:trace_config_proto": "@opencensus_proto//opencensus/proto/trace/v1:trace_config_proto_cc",
     "@opentelemetry_proto//:trace": "@opentelemetry_proto//:trace_cc_proto",
     "@opentelemetry_proto//:logs": "@opentelemetry_proto//:logs_cc_proto",
+    "@opentelemetry_proto//:metrics": "@opentelemetry_proto//:metrics_cc_proto",
     "@opentelemetry_proto//:common": "@opentelemetry_proto//:common_cc_proto",
 }
 
@@ -56,5 +58,6 @@ EXTERNAL_PROTO_PY_BAZEL_DEP_MAP = {
     "@opencensus_proto//opencensus/proto/trace/v1:trace_config_proto": "@opencensus_proto//opencensus/proto/trace/v1:trace_config_proto_py",
     "@opentelemetry_proto//:trace": "@opentelemetry_proto//:trace_py_proto",
     "@opentelemetry_proto//:logs": "@opentelemetry_proto//:logs_py_proto",
+    "@opentelemetry_proto//:metrics": "@opentelemetry_proto//:metrics_py_proto",
     "@opentelemetry_proto//:common": "@opentelemetry_proto//:common_py_proto",
 }

bazel/repositories.bzl

@@ -163,6 +163,26 @@ go_proto_library(
     visibility = ["//visibility:public"],
 )
 
+api_cc_py_proto_library(
+    name = "metrics",
+    srcs = [
+        "opentelemetry/proto/collector/metrics/v1/metrics_service.proto",
+        "opentelemetry/proto/metrics/v1/metrics.proto",
+    ],
+    deps = [
+        "//:common",
+        "//:resource",
+    ],
+    visibility = ["//visibility:public"],
+)
+
+go_proto_library(
+    name = "metrics_go_proto",
+    importpath = "go.opentelemetry.io/proto/otlp/metrics/v1",
+    proto = ":metrics",
+    visibility = ["//visibility:public"],
+)
+
 api_cc_py_proto_library(
     name = "trace",
     srcs = [

envoy/extensions/stat_sinks/open_telemetry/v3/BUILD

@@ -0,0 +1,12 @@
+# DO NOT EDIT. This file is generated by tools/proto_format/proto_sync.py.
+
+load("@envoy_api//bazel:api_build_system.bzl", "api_proto_package")
+
+licenses(["notice"])  # Apache 2
+
+api_proto_package(
+    deps = [
+        "//envoy/config/core/v3:pkg",
+        "@com_github_cncf_udpa//udpa/annotations:pkg",
+    ],
+)

envoy/extensions/stat_sinks/open_telemetry/v3/open_telemetry.proto

@@ -0,0 +1,47 @@
+syntax = "proto3";
+
+package envoy.extensions.stat_sinks.open_telemetry.v3;
+
+import "envoy/config/core/v3/grpc_service.proto";
+
+import "google/protobuf/wrappers.proto";
+
+import "udpa/annotations/status.proto";
+import "validate/validate.proto";
+
+option java_package = "io.envoyproxy.envoy.extensions.stat_sinks.open_telemetry.v3";
+option java_outer_classname = "OpenTelemetryProto";
+option java_multiple_files = true;
+option go_package = "github.com/envoyproxy/go-control-plane/envoy/extensions/stat_sinks/open_telemetry/v3;open_telemetryv3";
+option (udpa.annotations.file_status).package_version_status = ACTIVE;
+
+// [#protodoc-title: Open Telemetry Stats Sink]
+// Stats configuration proto schema for ``envoy.stat_sinks.open_telemetry`` sink.
+// [#extension: envoy.stat_sinks.open_telemetry]
+
+// [#next-free-field: 6]
+message SinkConfig {
+  oneof protocol_specifier {
+    option (validate.required) = true;
+
+    // The upstream gRPC cluster that implements the OTLP/gRPC collector.
+    config.core.v3.GrpcService grpc_service = 1 [(validate.rules).message = {required: true}];
+  }
+
+  // If set to true, counters will be emitted as deltas, and the OTLP message will have
+  // ``AGGREGATION_TEMPORALITY_DELTA`` set as AggregationTemporality.
+  bool report_counters_as_deltas = 2;
+
+  // If set to true, histograms will be emitted as deltas, and the OTLP message will have
+  // ``AGGREGATION_TEMPORALITY_DELTA`` set as AggregationTemporality.
+  bool report_histograms_as_deltas = 3;
+
+  // If set to true, metrics will have their tags emitted as OTLP attributes, which may
+  // contain values used by the tag extractor or additional tags added during stats creation.
+  // Otherwise, no attributes will be associated with the export message. Default value is true.
+  google.protobuf.BoolValue emit_tags_as_attributes = 4;
+
+  // If set to true, metric names will be represented as the tag extracted name instead
+  // of the full metric name. Default value is true.
+  google.protobuf.BoolValue use_tag_extracted_name = 5;
+}

versioning/BUILD

@@ -225,6 +225,7 @@ proto_library(
         "//envoy/extensions/retry/host/previous_hosts/v3:pkg",
         "//envoy/extensions/retry/priority/previous_priorities/v3:pkg",
         "//envoy/extensions/stat_sinks/graphite_statsd/v3:pkg",
+        "//envoy/extensions/stat_sinks/open_telemetry/v3:pkg",
         "//envoy/extensions/stat_sinks/wasm/v3:pkg",
         "//envoy/extensions/transport_sockets/alts/v3:pkg",
         "//envoy/extensions/transport_sockets/http_11_proxy/v3:pkg",