message: enable prometheus-based metrics on 10% of servers
diff: @@ -156,7 +156,7 @@ async function main() {
  let metricsWriter: UsageMetricsWriter;
  let metricsReader: UsageMetrics;
  const rollouts = createRolloutTracker(serverConfig);
  - if (rollouts.isRolloutEnabled('prometheus', 0)) {
  + if (rollouts.isRolloutEnabled('prometheus', 10)) {
  const prometheusPort = await portProvider.reserveFirstFreePort(9090);
  const prometheusLocation = `localhost:${prometheusPort}`;
  