When a new agent joins the fleet, I want to make a few notes on my application. Is it possible to get a notification whenever a new agent joins to fleet?

I checked elasticsearch watcher but haven't found solution so far.

Tldr;

There are no built in mechanism to perform such a task.

Nonetheless it is possible to create it, but it will be a bit of a hack.

• Use the .fleet-agents index which won't be accessible in the 8.x releases
• Use the Kibana agent api which is in experimental state.