Remove ABI macros from SDK.

Author: uuzay

exporters/otlp/src/otlp_metric_utils.cc

@@ -297,9 +297,7 @@ sdk::metrics::AggregationTemporality OtlpMetricUtils::DeltaTemporalitySelector(
     case sdk::metrics::InstrumentType::kObservableCounter:
     case sdk::metrics::InstrumentType::kHistogram:
     case sdk::metrics::InstrumentType::kObservableGauge:
-#if OPENTELEMETRY_ABI_VERSION_NO >= 2
     case sdk::metrics::InstrumentType::kGauge:
-#endif
       return sdk::metrics::AggregationTemporality::kDelta;
     case sdk::metrics::InstrumentType::kUpDownCounter:
     case sdk::metrics::InstrumentType::kObservableUpDownCounter:
@@ -323,9 +321,7 @@ sdk::metrics::AggregationTemporality OtlpMetricUtils::LowMemoryTemporalitySelect
     case sdk::metrics::InstrumentType::kHistogram:
       return sdk::metrics::AggregationTemporality::kDelta;
     case sdk::metrics::InstrumentType::kObservableCounter:
-#if OPENTELEMETRY_ABI_VERSION_NO >= 2
     case sdk::metrics::InstrumentType::kGauge:
-#endif
     case sdk::metrics::InstrumentType::kObservableGauge:
     case sdk::metrics::InstrumentType::kUpDownCounter:
     case sdk::metrics::InstrumentType::kObservableUpDownCounter:

sdk/include/opentelemetry/sdk/metrics/aggregation/default_aggregation.h

@@ -180,9 +180,7 @@ class DefaultAggregation
         return AggregationType::kSum;
       case InstrumentType::kHistogram:
         return AggregationType::kHistogram;
-#if OPENTELEMETRY_ABI_VERSION_NO >= 2
       case InstrumentType::kGauge:
-#endif
       case InstrumentType::kObservableGauge:
         return AggregationType::kLastValue;
       default:

sdk/include/opentelemetry/sdk/metrics/instruments.h

@@ -19,9 +19,7 @@ enum class InstrumentType
   kCounter,
   kHistogram,
   kUpDownCounter,
-#if OPENTELEMETRY_ABI_VERSION_NO >= 2
   kGauge,
-#endif
   kObservableCounter,
   kObservableGauge,
   kObservableUpDownCounter