[SDK] Support OTEL_SDK_DISABLED environment variable (open-telemetry#3245)

Author: marcalff

CHANGELOG.md

@@ -18,6 +18,28 @@ Increment the:
 * [SDK] Add tracer scope configurator
   [#3137](https://github.com/open-telemetry/opentelemetry-cpp/pull/3137)
 
+* [SDK] Support OTEL_SDK_DISABLED environment variable
+  [#3245](https://github.com/open-telemetry/opentelemetry-cpp/pull/3245)
+
+Important changes:
+
+* [SDK] Support OTEL_SDK_DISABLED environment variable
+  [#3245](https://github.com/open-telemetry/opentelemetry-cpp/pull/3245)
+
+  * The SDK now exposes the following new methods:
+
+    * opentelemetry::sdk::trace::Provider::SetTracerProvider()
+    * opentelemetry::sdk::metrics::Provider::SetMeterProvider()
+    * opentelemetry::sdk::logs::Provider::SetLoggerProvider()
+
+  * These methods do support the `OTEL_SDK_DISABLED` environment variable,
+    unlike the corresponding existing API Provider classes.
+
+  * Applications are encouraged to migrate from the API to the SDK
+    `Provider` classes, to benefit from this feature.
+
+  * All the example code has been updated to reflect the new usage.
+
 ## [1.19 2025-01-22]
 
 * [PROMETHEUS_EXPORTER] Fix default for emitting otel_scope attributes

api/include/opentelemetry/metrics/provider.h

@@ -5,8 +5,8 @@
 
 #include <mutex>
 
-#include "opentelemetry/common/macros.h"
 #include "opentelemetry/common/spin_lock_mutex.h"
+#include "opentelemetry/metrics/meter_provider.h"
 #include "opentelemetry/metrics/noop.h"
 #include "opentelemetry/nostd/shared_ptr.h"
 #include "opentelemetry/version.h"
@@ -15,8 +15,6 @@ OPENTELEMETRY_BEGIN_NAMESPACE
 namespace metrics
 {
 
-class MeterProvider;
-
 /**
  * Stores the singleton global MeterProvider.
  */

api/test/metrics/meter_provider_test.cc

@@ -3,6 +3,7 @@
 
 #include <gtest/gtest.h>
 
+#include "opentelemetry/metrics/meter_provider.h"
 #include "opentelemetry/metrics/noop.h"
 #include "opentelemetry/metrics/provider.h"
 #include "opentelemetry/nostd/shared_ptr.h"

examples/batch/main.cc

@@ -16,6 +16,7 @@
 #include "opentelemetry/sdk/trace/batch_span_processor_options.h"
 #include "opentelemetry/sdk/trace/exporter.h"
 #include "opentelemetry/sdk/trace/processor.h"
+#include "opentelemetry/sdk/trace/provider.h"
 #include "opentelemetry/sdk/trace/tracer_provider.h"
 #include "opentelemetry/sdk/trace/tracer_provider_factory.h"
 #include "opentelemetry/trace/provider.h"
@@ -56,13 +57,13 @@ void InitTracer()
       trace_sdk::TracerProviderFactory::Create(std::move(processor), resource);
 
   // Set the global trace provider.
-  trace_api::Provider::SetTracerProvider(provider);
+  trace_sdk::Provider::SetTracerProvider(provider);
 }
 
 void CleanupTracer()
 {
   std::shared_ptr<opentelemetry::trace::TracerProvider> none;
-  trace_api::Provider::SetTracerProvider(none);
+  trace_sdk::Provider::SetTracerProvider(none);
 }
 
 opentelemetry::nostd::shared_ptr<trace_api::Tracer> get_tracer()

examples/grpc/tracer_common.h

@@ -9,6 +9,7 @@
 #include "opentelemetry/nostd/shared_ptr.h"
 #include "opentelemetry/sdk/trace/exporter.h"
 #include "opentelemetry/sdk/trace/processor.h"
+#include "opentelemetry/sdk/trace/provider.h"
 #include "opentelemetry/sdk/trace/simple_processor_factory.h"
 #include "opentelemetry/sdk/trace/tracer_context.h"
 #include "opentelemetry/sdk/trace/tracer_context_factory.h"
@@ -85,7 +86,7 @@ void InitTracer()
   std::shared_ptr<opentelemetry::trace::TracerProvider> provider =
       opentelemetry::sdk::trace::TracerProviderFactory::Create(std::move(context));
   // Set the global trace provider
-  opentelemetry::trace::Provider::SetTracerProvider(provider);
+  opentelemetry::sdk::trace::Provider::SetTracerProvider(provider);
 
   // set global propagator
   opentelemetry::context::propagation::GlobalTextMapPropagator::SetGlobalPropagator(
@@ -96,7 +97,7 @@ void InitTracer()
 void CleanupTracer()
 {
   std::shared_ptr<opentelemetry::trace::TracerProvider> none;
-  opentelemetry::trace::Provider::SetTracerProvider(none);
+  opentelemetry::sdk::trace::Provider::SetTracerProvider(none);
 }
 
 opentelemetry::nostd::shared_ptr<opentelemetry::trace::Tracer> get_tracer(std::string tracer_name)

examples/http/tracer_common.h

@@ -3,24 +3,24 @@
 
 #pragma once
 
+#include <cstring>
+#include <iostream>
+#include <vector>
+
+#include "opentelemetry/context/propagation/global_propagator.h"
+#include "opentelemetry/context/propagation/text_map_propagator.h"
 #include "opentelemetry/exporters/ostream/span_exporter_factory.h"
+#include "opentelemetry/ext/http/client/http_client.h"
+#include "opentelemetry/nostd/shared_ptr.h"
 #include "opentelemetry/sdk/trace/exporter.h"
 #include "opentelemetry/sdk/trace/processor.h"
+#include "opentelemetry/sdk/trace/provider.h"
 #include "opentelemetry/sdk/trace/simple_processor_factory.h"
 #include "opentelemetry/sdk/trace/tracer_context.h"
 #include "opentelemetry/sdk/trace/tracer_context_factory.h"
 #include "opentelemetry/sdk/trace/tracer_provider_factory.h"
-#include "opentelemetry/trace/provider.h"
-
-#include "opentelemetry/context/propagation/global_propagator.h"
-#include "opentelemetry/context/propagation/text_map_propagator.h"
 #include "opentelemetry/trace/propagation/http_trace_context.h"
-
-#include <cstring>
-#include <iostream>
-#include <vector>
-#include "opentelemetry/ext/http/client/http_client.h"
-#include "opentelemetry/nostd/shared_ptr.h"
+#include "opentelemetry/trace/provider.h"
 
 namespace
 {
@@ -75,7 +75,7 @@ void InitTracer()
   std::shared_ptr<opentelemetry::trace::TracerProvider> provider =
       opentelemetry::sdk::trace::TracerProviderFactory::Create(std::move(context));
   // Set the global trace provider
-  opentelemetry::trace::Provider::SetTracerProvider(provider);
+  opentelemetry::sdk::trace::Provider::SetTracerProvider(provider);
 
   // set global propagator
   opentelemetry::context::propagation::GlobalTextMapPropagator::SetGlobalPropagator(
@@ -86,7 +86,7 @@ void InitTracer()
 void CleanupTracer()
 {
   std::shared_ptr<opentelemetry::trace::TracerProvider> none;
-  opentelemetry::trace::Provider::SetTracerProvider(none);
+  opentelemetry::sdk::trace::Provider::SetTracerProvider(none);
 }
 
 opentelemetry::nostd::shared_ptr<opentelemetry::trace::Tracer> get_tracer(std::string tracer_name)

examples/logs_simple/main.cc

@@ -7,18 +7,18 @@
 #include "opentelemetry/exporters/ostream/log_record_exporter.h"
 #include "opentelemetry/exporters/ostream/span_exporter_factory.h"
 #include "opentelemetry/logs/logger_provider.h"
-#include "opentelemetry/logs/provider.h"
 #include "opentelemetry/sdk/logs/exporter.h"
 #include "opentelemetry/sdk/logs/logger_provider.h"
 #include "opentelemetry/sdk/logs/logger_provider_factory.h"
 #include "opentelemetry/sdk/logs/processor.h"
+#include "opentelemetry/sdk/logs/provider.h"
 #include "opentelemetry/sdk/logs/simple_log_record_processor_factory.h"
 #include "opentelemetry/sdk/trace/exporter.h"
 #include "opentelemetry/sdk/trace/processor.h"
+#include "opentelemetry/sdk/trace/provider.h"
 #include "opentelemetry/sdk/trace/simple_processor_factory.h"
 #include "opentelemetry/sdk/trace/tracer_provider.h"
 #include "opentelemetry/sdk/trace/tracer_provider_factory.h"
-#include "opentelemetry/trace/provider.h"
 #include "opentelemetry/trace/tracer_provider.h"
 
 #ifdef BAZEL_BUILD
@@ -48,13 +48,13 @@ void InitTracer()
 
   // Set the global trace provider
   const std::shared_ptr<trace_api::TracerProvider> &api_provider = sdk_provider;
-  trace_api::Provider::SetTracerProvider(api_provider);
+  trace_sdk::Provider::SetTracerProvider(api_provider);
 }
 
 void CleanupTracer()
 {
   std::shared_ptr<trace_api::TracerProvider> noop;
-  trace_api::Provider::SetTracerProvider(noop);
+  trace_sdk::Provider::SetTracerProvider(noop);
 }
 
 void InitLogger()
@@ -69,13 +69,13 @@ void InitLogger()
 
   // Set the global logger provider
   const std::shared_ptr<logs_api::LoggerProvider> &api_provider = sdk_provider;
-  logs_api::Provider::SetLoggerProvider(api_provider);
+  logs_sdk::Provider::SetLoggerProvider(api_provider);
 }
 
 void CleanupLogger()
 {
   std::shared_ptr<logs_api::LoggerProvider> noop;
-  logs_api::Provider::SetLoggerProvider(noop);
+  logs_sdk::Provider::SetLoggerProvider(noop);
 }
 
 }  // namespace

examples/metrics_simple/metrics_ostream.cc

@@ -11,14 +11,14 @@
 #include "opentelemetry/common/attribute_value.h"
 #include "opentelemetry/exporters/ostream/metric_exporter_factory.h"
 #include "opentelemetry/metrics/meter_provider.h"
-#include "opentelemetry/metrics/provider.h"
 #include "opentelemetry/sdk/metrics/aggregation/aggregation_config.h"
 #include "opentelemetry/sdk/metrics/export/periodic_exporting_metric_reader_factory.h"
 #include "opentelemetry/sdk/metrics/export/periodic_exporting_metric_reader_options.h"
 #include "opentelemetry/sdk/metrics/instruments.h"
 #include "opentelemetry/sdk/metrics/meter_provider.h"
 #include "opentelemetry/sdk/metrics/meter_provider_factory.h"
 #include "opentelemetry/sdk/metrics/metric_reader.h"
+#include "opentelemetry/sdk/metrics/provider.h"
 #include "opentelemetry/sdk/metrics/push_metric_exporter.h"
 #include "opentelemetry/sdk/metrics/view/instrument_selector.h"
 #include "opentelemetry/sdk/metrics/view/instrument_selector_factory.h"
@@ -114,13 +114,13 @@ void InitMetrics(const std::string &name)
 
   std::shared_ptr<opentelemetry::metrics::MeterProvider> api_provider(std::move(provider));
 
-  metrics_api::Provider::SetMeterProvider(api_provider);
+  metrics_sdk::Provider::SetMeterProvider(api_provider);
 }
 
 void CleanupMetrics()
 {
   std::shared_ptr<metrics_api::MeterProvider> none;
-  metrics_api::Provider::SetMeterProvider(none);
+  metrics_sdk::Provider::SetMeterProvider(none);
 }
 }  // namespace
 

examples/multi_processor/main.cc

@@ -16,11 +16,11 @@
 #include "opentelemetry/nostd/string_view.h"
 #include "opentelemetry/sdk/trace/exporter.h"
 #include "opentelemetry/sdk/trace/processor.h"
+#include "opentelemetry/sdk/trace/provider.h"
 #include "opentelemetry/sdk/trace/simple_processor_factory.h"
 #include "opentelemetry/sdk/trace/span_data.h"
 #include "opentelemetry/sdk/trace/tracer_provider.h"
 #include "opentelemetry/sdk/trace/tracer_provider_factory.h"
-#include "opentelemetry/trace/provider.h"
 #include "opentelemetry/trace/span_id.h"
 #include "opentelemetry/trace/span_metadata.h"
 #include "opentelemetry/trace/trace_id.h"
@@ -55,15 +55,15 @@ std::shared_ptr<InMemorySpanData> InitTracer()
       trace_sdk::TracerProviderFactory::Create(std::move(processors));
 
   // Set the global trace provider
-  trace_api::Provider::SetTracerProvider(std::move(provider));
+  trace_sdk::Provider::SetTracerProvider(std::move(provider));
 
   return data;
 }
 
 void CleanupTracer()
 {
   std::shared_ptr<opentelemetry::trace::TracerProvider> none;
-  trace_api::Provider::SetTracerProvider(none);
+  trace_sdk::Provider::SetTracerProvider(none);
 }
 
 void dumpSpans(std::vector<std::unique_ptr<trace_sdk::SpanData>> &spans)

examples/multithreaded/main.cc

@@ -12,6 +12,7 @@
 #include "opentelemetry/sdk/resource/resource.h"
 #include "opentelemetry/sdk/trace/exporter.h"
 #include "opentelemetry/sdk/trace/processor.h"
+#include "opentelemetry/sdk/trace/provider.h"
 #include "opentelemetry/sdk/trace/simple_processor_factory.h"
 #include "opentelemetry/sdk/trace/tracer_provider.h"
 #include "opentelemetry/sdk/trace/tracer_provider_factory.h"
@@ -34,13 +35,13 @@ void InitTracer()
       trace_sdk::TracerProviderFactory::Create(std::move(processor),
                                                opentelemetry::sdk::resource::Resource::Create({}));
   // Set the global trace provider
-  trace_api::Provider::SetTracerProvider(provider);
+  trace_sdk::Provider::SetTracerProvider(provider);
 }
 
 void CleanupTracer()
 {
   std::shared_ptr<opentelemetry::trace::TracerProvider> none;
-  trace_api::Provider::SetTracerProvider(none);
+  trace_sdk::Provider::SetTracerProvider(none);
 }
 
 opentelemetry::nostd::shared_ptr<trace_api::Tracer> get_tracer()