docs: protected RrdDef getDatabaseTemplateSpec() throws Exception {
  		RrdDefTemplate t = new RrdDefTemplate(templateFile);
  		t.setVariable("database", this.outputFile.getCanonicalPath());
  		RrdDef def = t.getRrdDef();
  		if (!this.outputFile.exists()) {
  			FileUtils.forceMkdir(this.outputFile.getParentFile());
  			rrdToolCreateDatabase(def);
  		}
  		return def;
  	}