message: fix: fix mem usage
diff: @@ -53,7 +53,7 @@ export class SystemMemoryGaugeSet extends CachedMetricSet {
  metric: <Gauge<number>> {
  getValue() {
  self.refreshIfNecessary();
  - return self.SystemMemory['mem.used'] / self.SystemMemory['mem.total'];
  + return self.SystemMemory['MEM.USED'] / self.SystemMemory['MEM.TOTAL'];
  }
  }
  });
  