[Backend] Implement Notification Queue Metrics Service

[Abd-Standard]

Description

Track queue health metrics to improve observability and operational monitoring.

Tasks
Collect queue statistics.
Track processing times.
Measure failure rates.
Expose metrics endpoint.

Acceptance Criteria
Metrics are available through API.
Data remains accurate.
Monitoring integrations function properly.

[ironhood]

@ironhood has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello Team, the requirements for this feature are clear to me. My approach would be to implement it incrementally, validate edge cases, and ensure it integrates smoothly with existing functionality. Please permit me to take a ownership on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ironhood to this issue.

[Sparexonzy95]

Hi Team,
I'd like to work on this issue.
The main challenge here is ensuring clear visibility into queue health and performance. I plan to implement a metrics service that tracks queue statistics, processing latency, and failure rates in real time, then expose them through a dedicated API endpoint for monitoring integrations.
This will provide accurate operational insights, help identify bottlenecks early, and satisfy the observability requirements outlined in the acceptance criteria.
Looking forward to contributing.

[gloskull]

Hello, I have 4 years of experience delivering solutions for projects like this, covering backend, frontend, and smart contract development. After carefully reviewing your requirements, I have a clear understanding of the task and am confident in my ability to deliver a clean, efficient, and thoroughly tested solution on time. I prioritize code quality, maintainability, and industry best practices throughout the development process.
My PR will be submitted in under 10hours.

[Babigdk]

I'd like to work on this task. As a software engineer experienced with backend observability, monitoring systems, and distributed processing, I can add queue health metrics to improve operational visibility.

I will implement queue statistics collection, track processing durations, measure failure rates, and expose the metrics through an API endpoint for monitoring integrations. The implementation will focus on accurate data collection, low overhead, and maintainable metric reporting.

The PR will include the metrics implementation, API exposure, tests, and validation notes to ensure monitoring tools can consume the data reliably.

[KCEE0901]

@KCEE0901 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello boss,
​I would love to take on this issue. I’ve reviewed the description and the requirements, and I am confident I can implement the solution efficiently.
​Could you please assign this to me? Thank you.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @KCEE0901 to this issue.

[michaelvic123]

@michaelvic123 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

please assign this issue to me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @michaelvic123 to this issue.

[grantfox-oss]

🦊 GrantFox — @michaelvic123 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #256)
2. Your PR will be reviewed by the Core-Foundry maintainers

Good luck! Track your progress on GrantFox.

[drips-wave]

Congratulations, @michaelvic123! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @michaelvic123: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊