@Override
    public void process(MetricsPacket.Builder builder) {
        String serviceIdValue = builder.getDimensionValue(toDimensionId(INTERNAL_SERVICE_ID));
        if (serviceIdValue != null)
            builder.putDimension(toDimensionId(SERVICE_ID), serviceIdValue);
    }
Copies the value of the internally used 'instance' dimension to the more aptly named 'serviceId'.

@author gjoranv
metrics-proxy/src/main/java/ai/vespa/metricsproxy/http/application/ServiceIdDimensionProcessor.java