How could I turn off [OK] notification (I want to receive only [Alerting])?
There is no option for this currently.
You do not say which notification channel you are using but if you are using the webhook for a manual integration then you could ignore OK notifications and only forward Alerting notifications.
I use email notification
Then no unless you are prepared to do some programming and build a custom integration with the alert webhook.
Do we have any option available now to turn off [OK] notification??
No, not currently. There is a feature request on GitHub if you want to track the progress of this issue.
I submitted a PR for this today, as the OK notifications are driving our Ops team crazy (we just added alerting with the new Elasticsearch alerting capability - yea - so this was new for us).
how can we skip in case of webhook notification, can you please provide me the reference