Remove "additional_payload" from telemetry

This was requested by the team involved in instrumentation telemetry.

src/datadog/datadog_agent.cpp

@@ -333,8 +333,8 @@ void DatadogAgent::flush() {
   }
 }
 
-void DatadogAgent::send_app_started(nlohmann::json&& tracer_config) {
-  auto payload = tracer_telemetry_->app_started(std::move(tracer_config));
+void DatadogAgent::send_app_started() {
+  auto payload = tracer_telemetry_->app_started();
   auto post_result = http_client_->post(
       telemetry_endpoint_, telemetry_set_request_headers_, std::move(payload),
       telemetry_on_response_, telemetry_on_error_);

src/datadog/datadog_agent.h

@@ -64,7 +64,7 @@ class DatadogAgent : public Collector {
       std::vector<std::unique_ptr<SpanData>>&& spans,
       const std::shared_ptr<TraceSampler>& response_handler) override;
 
-  void send_app_started(nlohmann::json&& tracer_config);
+  void send_app_started();
 
   nlohmann::json config_json() const override;
 };

src/datadog/tracer.cpp

@@ -268,7 +268,7 @@ Tracer::Tracer(const FinalizedTracerConfig& config,
                                                 clock, config.logger);
     collector_ = agent;
     if (tracer_telemetry_->enabled()) {
-      agent->send_app_started(config_json());
+      agent->send_app_started();
     }
   }
 

src/datadog/tracer_telemetry.cpp

@@ -80,20 +80,13 @@ nlohmann::json TracerTelemetry::generate_telemetry_body(
   });
 }
 
-std::string TracerTelemetry::app_started(nlohmann::json&& tracer_config) {
+std::string TracerTelemetry::app_started() {
   auto telemetry_body = generate_telemetry_body("app-started");
   // TODO: environment variables or finalized config details
   telemetry_body["payload"] = nlohmann::json::object({
       {"configuration", nlohmann::json::array({})},
 
   });
-  // TODO: Until we figure out "configuration", above, include a
-  // JSON dump of the tracer configuration as "additional_payload".
-  telemetry_body["additional_payload"] =
-      nlohmann::json::array({nlohmann::json::object({
-          {"name", "tracer_config_json"},
-          {"value", tracer_config.dump()},
-      })});
   auto app_started_payload = telemetry_body.dump();
   return app_started_payload;
 }

src/datadog/tracer_telemetry.h

@@ -40,7 +40,7 @@ struct SpanDefaults;
 
 class TracerTelemetry {
   bool enabled_ = false;
-  bool debug_ = false;
+  bool debug_ = true;
   Clock clock_;
   std::shared_ptr<Logger> logger_;
   std::shared_ptr<const SpanDefaults> span_defaults_;
@@ -108,7 +108,7 @@ class TracerTelemetry {
   auto& metrics() { return metrics_; };
   // Constructs an `app-started` message using information provided when
   // constructed and the tracer_config value passed in.
-  std::string app_started(nlohmann::json&& tracer_config);
+  std::string app_started();
   // This is used to take a snapshot of the current state of metrics and collect
   // timestamped "points" of values. These values are later submitted in
   // `generate-metrics` messages.

test/test_tracer_telemetry.cpp

@@ -28,7 +28,7 @@ TEST_CASE("Tracer telemetry") {
 
   SECTION("generates app-started message") {
     auto app_started_message =
-        tracer_telemetry.app_started(nlohmann::json::object());
+        tracer_telemetry.app_started();
     auto app_started = nlohmann::json::parse(app_started_message);
     REQUIRE(app_started["request_type"] == "app-started");
   }