@GetMapping("/check/healthcheck")
	public Map<String, Object> healthCheck(HttpServletResponse response) {
		if (config.hasShutdownLock()) {
			try {
				response.sendError(503, "nGrinder is about to down");
			} catch (IOException e) {
				log.error("While running healthCheck() in HomeController, the error occurs.");
				log.error("Details : ", e);
			}
		}
		Map<String, Object> map = new HashMap<>();
		map.put("current", regionService.getCurrent());
		map.put("regions", regionService.getAll());
		return map;
	}
Return the health check message. If there is shutdown lock, it returns
503. Otherwise it returns region lists.

@param response response
@return region list
ngrinder-controller/src/main/java/org/ngrinder/home/controller/HealthCheckApiController.java