Set ExemplarFilter in SDK

Author: ThomsonTan

sdk/include/opentelemetry/sdk/metrics/meter_context.h

@@ -12,6 +12,7 @@
 #include "opentelemetry/common/timestamp.h"
 #include "opentelemetry/nostd/function_ref.h"
 #include "opentelemetry/nostd/span.h"
+#include "opentelemetry/sdk/metrics/exemplar/filter.h"
 #include "opentelemetry/sdk/metrics/view/view_registry.h"
 #include "opentelemetry/sdk/resource/resource.h"
 #include "opentelemetry/version.h"
@@ -107,6 +108,9 @@ class MeterContext : public std::enable_shared_from_this<MeterContext>
                std::unique_ptr<MeterSelector> meter_selector,
                std::unique_ptr<View> view) noexcept;
 
+  void SetExemplarFilter(
+      std::unique_ptr<metrics::ExemplarFilter> exemplar_filter) noexcept;
+
   /**
    * NOTE - INTERNAL method, can change in future.
    * Adds a meter to the list of configured meters in thread safe manner.
@@ -135,6 +139,7 @@ class MeterContext : public std::enable_shared_from_this<MeterContext>
   opentelemetry::sdk::resource::Resource resource_;
   std::vector<std::shared_ptr<CollectorHandle>> collectors_;
   std::unique_ptr<ViewRegistry> views_;
+  std::unique_ptr<metrics::ExemplarFilter> exemplar_filter_;
   opentelemetry::common::SystemTimestamp sdk_start_ts_;
   std::vector<std::shared_ptr<Meter>> meters_;
 

sdk/include/opentelemetry/sdk/metrics/meter_provider.h

@@ -10,6 +10,7 @@
 #include "opentelemetry/metrics/meter_provider.h"
 #include "opentelemetry/nostd/shared_ptr.h"
 #include "opentelemetry/nostd/string_view.h"
+#include "opentelemetry/sdk/metrics/exemplar/filter.h"
 #include "opentelemetry/sdk/metrics/view/view_registry.h"
 #include "opentelemetry/sdk/resource/resource.h"
 #include "opentelemetry/version.h"
@@ -100,6 +101,9 @@ class MeterProvider final : public opentelemetry::metrics::MeterProvider
                std::unique_ptr<MeterSelector> meter_selector,
                std::unique_ptr<View> view) noexcept;
 
+  void SetExemplarFilter(
+      std::unique_ptr<metrics::ExemplarFilter> exemplar_filter) noexcept;
+
   /**
    * Shutdown the meter provider.
    */

sdk/src/metrics/meter_context.cc

@@ -74,6 +74,12 @@ void MeterContext::AddView(std::unique_ptr<InstrumentSelector> instrument_select
   views_->AddView(std::move(instrument_selector), std::move(meter_selector), std::move(view));
 }
 
+void MeterContext::SetExemplarFilter(
+    std::unique_ptr<metrics::ExemplarFilter> exemplar_filter) noexcept
+{
+  exemplar_filter_ = std::move(exemplar_filter);
+}
+
 void MeterContext::AddMeter(std::shared_ptr<Meter> meter)
 {
   std::lock_guard<opentelemetry::common::SpinLockMutex> guard(meter_lock_);

sdk/src/metrics/meter_provider.cc

@@ -110,6 +110,12 @@ void MeterProvider::AddView(std::unique_ptr<InstrumentSelector> instrument_selec
                            std::move(view));
 }
 
+void MeterProvider::SetExemplarFilter(
+    std::unique_ptr<metrics::ExemplarFilter> exemplar_filter) noexcept
+{
+  return context_->SetExemplarFilter(std::move(exemplar_filter));
+}
+
 /**
  * Shutdown the meter provider.
  */