codegen/src/main/java/software/amazon/awssdk/codegen/poet/client/SyncClientClass.java [417:450]:
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    private MethodSpec resolveMetricPublishersMethod() {
        String clientConfigName = "clientConfiguration";
        String requestOverrideConfigName = "requestOverrideConfiguration";

        MethodSpec.Builder methodBuilder = MethodSpec.methodBuilder("resolveMetricPublishers")
                .addModifiers(PRIVATE, STATIC)
                .returns(ParameterizedTypeName.get(List.class, MetricPublisher.class))
                .addParameter(SdkClientConfiguration.class, clientConfigName)
                .addParameter(RequestOverrideConfiguration.class, requestOverrideConfigName);

        String publishersName = "publishers";

        methodBuilder.addStatement("$T $N = null", ParameterizedTypeName.get(List.class, MetricPublisher.class), publishersName);

        methodBuilder.beginControlFlow("if ($N != null)", requestOverrideConfigName)
                .addStatement("$N = $N.metricPublishers()", publishersName, requestOverrideConfigName)
                .endControlFlow();

        methodBuilder.beginControlFlow("if ($1N == null || $1N.isEmpty())", publishersName)
                .addStatement("$N = $N.option($T.$N)",
                              publishersName,
                              clientConfigName,
                              SdkClientOption.class,
                              "METRIC_PUBLISHERS")
                .endControlFlow();

        methodBuilder.beginControlFlow("if ($1N == null)", publishersName)
                .addStatement("$N = $T.emptyList()", publishersName, Collections.class)
                .endControlFlow();

        methodBuilder.addStatement("return $N", publishersName);

        return methodBuilder.build();
    }
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codegen/src/main/java/software/amazon/awssdk/codegen/poet/client/AsyncClientClass.java [580:613]:
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    private MethodSpec resolveMetricPublishersMethod() {
        String clientConfigName = "clientConfiguration";
        String requestOverrideConfigName = "requestOverrideConfiguration";

        MethodSpec.Builder methodBuilder = MethodSpec.methodBuilder("resolveMetricPublishers")
                .addModifiers(PRIVATE, STATIC)
                .returns(ParameterizedTypeName.get(List.class, MetricPublisher.class))
                .addParameter(SdkClientConfiguration.class, clientConfigName)
                .addParameter(RequestOverrideConfiguration.class, requestOverrideConfigName);

        String publishersName = "publishers";

        methodBuilder.addStatement("$T $N = null", ParameterizedTypeName.get(List.class, MetricPublisher.class), publishersName);

        methodBuilder.beginControlFlow("if ($N != null)", requestOverrideConfigName)
                .addStatement("$N = $N.metricPublishers()", publishersName, requestOverrideConfigName)
                .endControlFlow();

        methodBuilder.beginControlFlow("if ($1N == null || $1N.isEmpty())", publishersName)
                .addStatement("$N = $N.option($T.$N)",
                              publishersName,
                              clientConfigName,
                              SdkClientOption.class,
                              "METRIC_PUBLISHERS")
                .endControlFlow();

        methodBuilder.beginControlFlow("if ($1N == null)", publishersName)
                .addStatement("$N = $T.emptyList()", publishersName, Collections.class)
                .endControlFlow();

        methodBuilder.addStatement("return $N", publishersName);

        return methodBuilder.build();
    }
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