docs: public void register(String name, HealthCheck healthCheck) {
          HealthCheck registered;
          synchronized (lock) {
              if (healthChecks.containsKey(name)) {
                  throw new IllegalArgumentException("A health check named " + name + " already exists");
              }
              registered = healthCheck;
              if (healthCheck.getClass().isAnnotationPresent(Async.class)) {
                  registered = new AsyncHealthCheckDecorator(healthCheck, asyncExecutorService);
              }
              healthChecks.put(name, registered);
          }
          onHealthCheckAdded(name, registered);
      }