Metric aggregation not working for me

[chanda1998]

we want to achieve metric aggregation using custom attribute in span. We have provided a meter provide customizer in autoConfiguration object like this
@OverRide public void customize(AutoConfigurationCustomizer autoConfiguration) { configure(); autoConfiguration .addTracerProviderCustomizer(this::configureSdkTracerProvider) .addMeterProviderCustomizer(this::meterProviderCustomizer); } private SdkMeterProviderBuilder meterProviderCustomizer(SdkMeterProviderBuilder builder, ConfigProperties config) {       return builder.registerView(InstrumentSelector.builder().setName("http.server.request.duration").build()        , View.builder().setAttributeFilter(new HashSet(Arrays.asList("cav.BT"))).build()); } but still there is no aggregation of metric, spans and metrices are comming same way as before. Is there any other configuration or code needed to achieve custom aggregation?