@Override
	protected int detectStorageLevel(TaskMonitor monitor) {
		// if the PINGME files exists, it means this directory was initialized as
		// a real symbol server. If not, its probably just a normal directory
		// that contains files.
		File pingMeFile = new File(rootDir, PINGME_FILENAME);
		File adminDir = new File(rootDir, ADMIN_DIRNAME);
		if (pingMeFile.isFile() && adminDir.isDirectory()) {
			return super.detectStorageLevel(monitor);
		}
		return doHackyStorageLevelDetection(monitor);
	}
Non-task monitor variant of {@link #isValid(TaskMonitor)}.

@return boolean true if this is a valid symbol store
Ghidra/Features/PDB/src/main/java/pdb/symbolserver/LocalSymbolStore.java