@Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (o == null || getClass() != o.getClass())
            return false;
        MetaInAlarm that = (MetaInAlarm) o;
        return getId0().equals(that.getId0()) && getId1().equals(that.getId1());
    }
Only exist in multiple IDs case, Such as ServiceRelation, id1 represents the dest service id
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/alarm/MetaInAlarm.java