## Description
---
> This PR introduces a new observability tool that allows fetching
system and query level metrics from the Cloud Monitoring API for AlloyDB
instances.
>
> The key changes include:
> - A new observability tool that can make authenticated requests to the
monitoring API.
> - Pre-built configurations in observability.yaml for fetching AlloyDB
system and query metrics.
> - Unit and integration tests for the new observability tool.
> - List of metrics is fetched from the public documentation available
https://cloud.google.com/alloydb/docs/reference/system-insights-metrics
> - Manual testing is also done by locally running the server/tools and
integrating with Gemini CLI
## Followup Changes
---
> - Similar observability tools for Postgres, MySQL and SQLServer.
> - Documentation around the tools.
## PR Checklist
---
> Thank you for opening a Pull Request! Before submitting your PR, there
are a
> few things you can do to make sure it goes smoothly:
- [x] Make sure you reviewed
CONTRIBUTING.md
(https://github.com/googleapis/genai-toolbox/blob/main/CONTRIBUTING.md)
- [x] Make sure to open an issue as a
bug/issue
(https://github.com/googleapis/langchain-google-alloydb-pg-python/issues/new/choose)
before writing your code! That way we can discuss the change, evaluate
designs, and agree on the general idea
- [x] Ensure the tests and linter pass
- [x] Code coverage does not decrease (if any source code was changed)
- [] Appropriate docs were updated (if necessary)
- [ ] Make sure to add ! if this involve a breaking change
Tested Locally:
<img width="4886" height="3068" alt="image"
src="https://github.com/user-attachments/assets/774d0776-6c91-48aa-8d1a-64d84cfdbc75"
/>
<img width="4752" height="2778" alt="image"
src="https://github.com/user-attachments/assets/839f099a-dd1a-410c-bbe4-9913603e5ff3"
/>
