Return a dictionary of {app_id: (app_name, tracking_url)} for running Spark applications.

def _yarn_init(self, rm_address, requests_config, tags):
        """
        Return a dictionary of {app_id: (app_name, tracking_url)} for running Spark applications.
        """
        running_apps = self._yarn_get_running_spark_apps(rm_address, requests_config, tags)

        # Report success after gathering all metrics from ResourceManager
        self.service_check(
            YARN_SERVICE_CHECK,
            AgentCheck.OK,
            tags=['url:%s' % rm_address] + tags,
            message='Connection to ResourceManager "%s" was successful' % rm_address,
        )

        return running_apps