public Set<String> getAllMonitorMetricNames(String hostName) {
        // Find instance group
        return findInstanceGroup(hostName).map(InstanceGroup::getEnabledKeys).orElse(null);
    }
Get all key names when Zabbix agent queried
oap-server/server-receiver-plugin/skywalking-zabbix-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/zabbix/provider/ZabbixMetrics.java