supabase / supabase / 30233877554

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github

Add top blocker overview card (#48290)

## Context

Adds a "Top blocker" overview card for Database Connections
This should provide a better signal if there's any process that's
behaving as a bottleneck for multiple blocked queries
<img width="977" height="256" alt="image"
src="https://github.com/user-attachments/assets/3d5129a8-f0d7-40a6-808e-0d902889d997"
/>

^ We only highlight the card in red if the query is blocking more than 3
other queries to account - otherwise the signal might be too noisy

<img width="965" height="262" alt="image"
src="https://github.com/user-attachments/assets/f3fda77a-8d52-4e5d-8717-66a26f511a3c"
/>

## Other changes involved
- Am swapping the card positions around a little
- Longest running query card shows the PID as the primary information,
followed by the duration of the run



<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added a **Top blocker** metric to the Database Connections Overview to
highlight the PID/account blocking the most other queries.
* Warning styling now appears when a query blocks more than **3** other
queries.
* Reorganized the metrics layout and ordering for improved visibility
(active, idle-in-transaction, blocked, top blocker, and longest
running).
* **Bug Fixes**
* Updated tooltip and guidance text for clearer explanations of blocked
and idle-in-transaction states.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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