@Override
    public void notify(final ConfigChangeEvent value) {
        if (value.getEventType().equals(EventType.DELETE)) {
            ruleSetting = null;
            grouping.setEndpointGroupingRule(new QuickUriGroupingRule());
        } else {
            ruleSetting = value.getNewValue();
            grouping.setEndpointGroupingRule(new EndpointGroupingRuleReader(new StringReader(ruleSetting)).read());
        }
    }
The config change watcher for endpoint name grouping rule.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/config/group/EndpointNameGroupingRuleWatcher.java