zhyyu commented on issue #7169:
URL: https://github.com/apache/skywalking/issues/7169#issuecomment-869431894
> If `if (newItemValue == null) {` and `if (watcher.value() == null) {`
matched, nothing should happen, like `// Don't need to notify, stay in null.`.
But when init `DBLatencyThresholdsAndWatcher`, it will use default value to
set the watcher value, so `watcher.value() == null` cannot be true and then
trigger the delete event.
```
public DBLatencyThresholdsAndWatcher(String config, ModuleProvider provider)
{
// ...
activeSetting(config);
}
private void activeSetting(String config) {
// ...
settingsString.set(config);
}
@Override
public String value() {
return settingsString.get();
}
```
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