code: def get_limits(self):
          
          if self.limits != {}:
              return self.limits
          limits = {}
          limits['Groups'] = AwsLimit(
              'Groups',
              self,
              300,
              self.warning_threshold,
              self.critical_threshold,
              limit_type='AWS::IAM::Group',
          )
          limits['Users'] = AwsLimit(
              'Users',
              self,
              5000,
              self.warning_threshold,
              self.critical_threshold,
              limit_type='AWS::IAM::User',
          )
          limits['Roles'] = AwsLimit(
              'Roles',
              self,
              1000,
              self.warning_threshold,
              self.critical_threshold,
              limit_type='AWS::IAM::Role',
          )
          limits['Instance profiles'] = AwsLimit(
              'Instance profiles',
              self,
              1000,
              self.warning_threshold,
              self.critical_threshold,
              limit_type='AWS::IAM::InstanceProfile',
          )
          limits['Server certificates'] = AwsLimit(
              'Server certificates',
              self,
              20,
              self.warning_threshold,
              self.critical_threshold,
              limit_type='AWS::IAM::ServerCertificate',
          )
          limits['Policies'] = AwsLimit(
              'Policies',
              self,
              1500,
              self.warning_threshold,
              self.critical_threshold,
              limit_type='AWS::IAM::Policy',
          )
          limits['Policy Versions In Use'] = AwsLimit(
              'Policy Versions In Use',
              self,
              10000,
              self.warning_threshold,
              self.critical_threshold,
              limit_type='AWS::IAM::ServerCertificate',
          )
          self.limits = limits
          return limits
docs: Return all known limits for this service, as a dict of their names
          to :py:class:`~.AwsLimit` objects.
  
          :returns: dict of limit names to :py:class:`~.AwsLimit` objects
          :rtype: dict