whole_func_string: function getRunner(runner_id, callback) {
              if (!runners[runner_id]) {
                  return callback(new e.BackendResourceNotFoundError(sprintf(
                    'Runner with uuid \'%s\' does not exist', runner_id)));
              } else {
                  return callback(null, runners[runner_id].active_at);
              }
          }
func_code_string: function getRunner(runner_id, callback) {
              if (!runners[runner_id]) {
                  return callback(new e.BackendResourceNotFoundError(sprintf(
                    'Runner with uuid \'%s\' does not exist', runner_id)));
              } else {
                  return callback(null, runners[runner_id].active_at);
              }
          }
func_documentation_string: Get the given runner id details - runner_id - String, unique identifier for runner. Required. - callback - f(err, runner)