code: public List<SystemKillsResponse> getUniverseSystemKills(String datasource, String ifNoneMatch) throws ApiException {
          ApiResponse<List<SystemKillsResponse>> resp = getUniverseSystemKillsWithHttpInfo(datasource, ifNoneMatch);
          return resp.getData();
      }
docs: Get system kills Get the number of ship, pod and NPC kills per solar
  system within the last hour ending at the timestamp of the Last-Modified
  header, excluding wormhole space. Only systems with kills will be listed
  --- This route is cached for up to 3600 seconds
  
  @param datasource
  The server name you would like data from (optional, default to
  tranquility)
  @param ifNoneMatch
  ETag from a previous request. A 304 will be returned if this
  matches the current ETag (optional)
  @return List&lt;SystemKillsResponse&gt;
  @throws ApiException
  If fail to call the API, e.g. server error or cannot
  deserialize the response body