code: protected int getAsyncThreads(Dsn dsn) {
          return Util.parseInteger(Lookup.lookup(ASYNC_THREADS_OPTION, dsn),
              Runtime.getRuntime().availableProcessors());
      }
docs: The number of threads used for the async connection.
  
  @param dsn Sentry server DSN which may contain options.
  @return The number of threads used for the async connection.