[Unified Observability] Custom visualizations on Observability Overview

[danielkhan]

Problem description

The overview page aims to provide a high-level representation of the overall state of a system.
While OOTB dashboards can provide generic information, custom dashboards show system-specific KPIs.
Examples are:

• Number of PODS in k8s deployments
• Sales metrics
• Performance of a specific key service

For this, we want to enable users to add a set of their own visualizations to the overview page.

User stories

• As a user I want to add my own visualizations to the overview page for the current space.
• As a user, I want to be able to define the size of these visualizations by dragging them within a fixed grid.

Solution proposal

Use the existing dashboarding/Lens functionality.

Issues

R&D

• [Unified o11y] What mechanisms do we have to show information in the overview page? #118242