private SourceReceiver getReceiver() {
        if (receiver == null) {
            receiver = manager.find(CoreModule.NAME).provider().getService(SourceReceiver.class);
        }
        return receiver;
    }
Save the alarm info into storage for UI query.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/alarm/AlarmStandardPersistence.java