apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/controller/InstanceController.java/InstanceController/getByRelease
class InstanceController:    @GetMapping("/envs/{env}/instances/by-release")
    public PageDTO<InstanceDTO> getByRelease(@PathVariable String env, @RequestParam long releaseId,
                                             @RequestParam(defaultValue = "0") int page,
                                             @RequestParam(defaultValue = "20") int size) {

        return instanceService.getByRelease(Env.valueOf(env), releaseId, page, size);
    }