zhyyu commented on issue #7169:
URL: https://github.com/apache/skywalking/issues/7169#issuecomment-869270599
> I want to ask where is the delete event comes from? Why it happens? Did
you really delete the key?
I didn't delete the key, I just not config it. And I checked the code,
found that
```
ConfigWatcherRegister
void configSync() {
// ...
if (newItemValue == null) {
if (watcher.value() != null) {
// Notify watcher, the new value is null with
delete event type.
watcher.notify(
new
ConfigChangeWatcher.ConfigChangeEvent(null,
ConfigChangeWatcher.EventType.DELETE));
} else {
// Don't need to notify, stay in null.
}
// ...
```
So if we don't config the dynamic config, it will send delete event.
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