public void consumeMetrics(MetricsParser.Collector consumer) {
        remoteMetricsFetcher.getMetrics(consumer, metricsFetchCount.get());
        metricsFetchCount.getAndIncrement();
    }
Get the Metrics registered for this service. Metrics are fetched over HTTP
if a metric http port has been defined, otherwise from log file
metrics-proxy/src/main/java/ai/vespa/metricsproxy/service/VespaService.java