public MetricsPacket build() {
            return new MetricsPacket(statusCode, statusMessage, timestamp, service, metrics, dimensions, consumers);
        }
Returns a modifiable copy of the dimension IDs of this builder, usually for use with {@link #retainDimensions(Collection)}.
metrics-proxy/src/main/java/ai/vespa/metricsproxy/metric/model/MetricsPacket.java