static MetricsPacket.Builder applyProcessors(MetricsPacket.Builder builder, MetricsProcessor... processors) {
        Arrays.stream(processors).forEach(processor -> processor.process(builder));
        return builder;
    }
Helper method to apply a list of processors to a metrics packet builder.
Returns the metrics packet builder (which has been processed in-place) for
convenient use in stream processing.
metrics-proxy/src/main/java/ai/vespa/metricsproxy/metric/model/processing/MetricsProcessor.java