code: protected Collection<String> getInAppFrames(Dsn dsn) {
          String inAppFramesOption = Lookup.lookup(IN_APP_FRAMES_OPTION, dsn);
          if (Util.isNullOrEmpty(inAppFramesOption)) {
              // Only warn if the user didn't set it at all
              if (inAppFramesOption == null) {
                  logger.warn("No '" + IN_APP_FRAMES_OPTION + "' was configured, this option is highly recommended "
                      + "as it affects stacktrace grouping and display on Sentry. See documentation: "
                      + "https://docs.sentry.io/clients/java/config/#in-application-stack-frames");
              }
              return Collections.emptyList();
          }
  
          List<String> inAppPackages = new ArrayList<>();
          for (String inAppPackage : inAppFramesOption.split(",")) {
              if (!inAppPackage.trim().equals("")) {
                  inAppPackages.add(inAppPackage);
              }
          }
  
          return inAppPackages;
      }
docs: Returns the list of package names to consider "in-app".
  <p>
  Those packages will be used with the {@link StackTraceInterface} to show frames that are a part of
  the main application in the Sentry UI by default.
  
  @param dsn Sentry server DSN which may contain options.
  @return the list of package names to consider "in-app".