@GET @ApiIgnore // until documented
  @Produces("text/plain")
  public Response getPreUpgradeChecks(@Context HttpHeaders headers, @Context UriInfo ui) {
    return handleRequest(headers, null, ui, Request.Type.GET, createResource());
  }
Handles GET /rolling_upgrades_check request.

@param headers headers
@param ui uri info
@return information about upgrade checks
ambari-server/src/main/java/org/apache/ambari/server/api/services/PreUpgradeCheckService.java