docs: private static void updateJobOverview(File webOverviewDir, File webDir) {
  		try (JsonGenerator gen = jacksonFactory.createGenerator(HistoryServer.createOrGetFile(webDir, JobsOverviewHeaders.URL))) {
  			File[] overviews = new File(webOverviewDir.getPath()).listFiles();
  			if (overviews != null) {
  				Collection<JobDetails> allJobs = new ArrayList<>(overviews.length);
  				for (File overview : overviews) {
  					MultipleJobsDetails subJobs = mapper.readValue(overview, MultipleJobsDetails.class);
  					allJobs.addAll(subJobs.getJobs());
  				}
  				mapper.writeValue(gen, new MultipleJobsDetails(allJobs));
  			}
  		} catch (IOException ioe) {
  			LOG.error("Failed to update job overview.", ioe);
  		}
  	}