Observability: display the UDF info on dashboard

[KeXiangWang]

Is your feature request related to a problem? Please describe.

Currently there's no extra info for UDF functions on our dashboard. Considering UDF is problematic as it usually includes interaction with User's server.

Describe the solution you'd like

1. add the basic info of UDF functions like signature(input types and output types).
2. add info that can help locate the executors containing UDF functions like ActorId and FragmentId. With this we can easily know which MVs are affected.

Describe alternatives you've considered

No response

Additional context

No response

[yufansong]

add info that can help locate the executors containing UDF functions like ActorId and FragmentId. With this we can easily know which MVs are affected.

Currently we already add the fragment_id labels without actor_id, because actor id label will cause too much data storaged in prometheus which may cause OOM.

add the basic info of UDF functions like signature(input types and output types).

For this suggestion, it is seems hard to add it into metrics. Maybe need to find another way to record it.

[github-actions]

This issue has been open for 60 days with no activity. Could you please update the status? Feel free to continue discussion or close as not planned.