code: private static synchronized void setupSafeLevelsIndex() {
          if (safeLevelsIndex != null) {
              return;
          }
          if (sensitiveTraceListResourceName == null) {
              sensitiveTraceListResourceName = "META-INF/logging/liberty.ras.rawtracelist.properties";
          }
          safeLevelsIndex = SafeTraceLevelIndexFactory.createPackageIndex(sensitiveTraceListResourceName);
      }
docs: /*
  Set up the PackageIndex of sensitive packages that will be used to
  filter the levels in TraceComponent. Create index only once!!!