code: public static SentryClient getStoredClient() {
          if (storedClient != null) {
              return storedClient;
          }
  
          synchronized (Sentry.class) {
              if (storedClient == null && !autoInitAttempted.get()) {
                  // attempt initialization by using configuration found in the environment
                  autoInitAttempted.set(true);
                  init();
              }
          }
  
          return storedClient;
      }
docs: Returns the last statically stored {@link SentryClient} instance. If no instance
  is already stored, the {@link #init()} method will be called one time in an attempt to
  create a {@link SentryClient}.
  
  @return statically stored {@link SentryClient} instance, or null.