Fix observable updown counter aggregation temporality in Geneva exporter (open-telemetry#571)

Author: Copilot

exporters/geneva/.gitignore

@@ -0,0 +1 @@
+build/

exporters/geneva/src/exporter.cc

@@ -47,10 +47,10 @@ Exporter::Exporter(const ExporterOptions &options)
 
 sdk::metrics::AggregationTemporality Exporter::GetAggregationTemporality(
     sdk::metrics::InstrumentType instrument_type) const noexcept {
-  if (instrument_type == sdk::metrics::InstrumentType::kUpDownCounter)
-    {
-      return sdk::metrics::AggregationTemporality::kCumulative;
-    }
+  if (instrument_type == sdk::metrics::InstrumentType::kUpDownCounter ||
+      instrument_type == sdk::metrics::InstrumentType::kObservableUpDownCounter) {
+    return sdk::metrics::AggregationTemporality::kCumulative;
+  }
   return sdk::metrics::AggregationTemporality::kDelta;
 }
 

exporters/geneva/test/metrics_exporter_test.cc

@@ -379,4 +379,24 @@ INSTANTIATE_TEST_SUITE_P(GenericMetricsExporterText,
                          GenericMetricsExporterTextFixture,
                          ::testing::Values(kUnixDomainPathUDS, kUnixDomainPathAbstractSocket));
 
+// Test for GetAggregationTemporality method
+TEST(GenevaExporterTest, GetAggregationTemporalityTest) {
+  ExporterOptions options{"Endpoint=unix:///tmp/test;Account=test;Namespace=test"};
+  Exporter exporter(options);
+  
+  // Test that kUpDownCounter returns kCumulative
+  EXPECT_EQ(exporter.GetAggregationTemporality(InstrumentType::kUpDownCounter), 
+            AggregationTemporality::kCumulative);
+            
+  // Test that kObservableUpDownCounter returns kCumulative
+  EXPECT_EQ(exporter.GetAggregationTemporality(InstrumentType::kObservableUpDownCounter), 
+            AggregationTemporality::kCumulative);
+            
+  // Test that other instrument types return kDelta
+  EXPECT_EQ(exporter.GetAggregationTemporality(InstrumentType::kCounter), 
+            AggregationTemporality::kDelta);
+  EXPECT_EQ(exporter.GetAggregationTemporality(InstrumentType::kHistogram), 
+            AggregationTemporality::kDelta);
+}
+
 #endif