[Backend] Implement application metrics (Prometheus)

[GoSTEAN]

Description

Add Prometheus metrics endpoint for observability.

Acceptance Criteria

• Expose /metrics endpoint
• Track: request latency, blockchain call latency, active WebSocket connections
• Track: predictions per minute, trade volume, error rate

Priority

🟡 P2 — Medium

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[Josetic224]

@Josetic224 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi @Netwalls,

I’d like to take this on. I’ve set up Prometheus/Grafana stacks for Node/Stellar backends before and can ensure these metrics provide high-resolution data without impacting performance.

My plan for the implementation:

Latency Histograms: For request and blockchain call latency, I’ll use Histogram types with custom buckets. This is far more useful than an "average" because it lets us track the p95 and p99 spikes during high network congestion.

Stellar-Specific Metrics: I’ll instrument the trade and prediction logic using Gauges for active volume and Counters for total success vs. failure rates.

WebSocket Monitoring: I'll hook into the connection and close events of your WS server to track real-time active connections.

Non-Blocking Middleware: I'll implement the tracking as middleware to ensure the /metrics collection doesn't add overhead to the core trade execution path.

Security: I’ll ensure the /metrics endpoint is properly isolated or restricted so it’s not exposed to the public internet by default.

I can have this ready for review within the next day or two. Can you assign this to me?

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[limitlxx]

@limitlxx has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

can you assign this issue to me

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[Chibey-max]

@Chibey-max has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hello Maintainers,

I’d like to work on implementing the Prometheus metrics endpoint for observability.

I have experience with backend development in Rust and integrating Prometheus for metrics such as request latency, error rates, and connection tracking. I will implement the /metrics endpoint and ensure accurate tracking of the required metrics with clean and maintainable integration.

I’m confident I can deliver a reliable implementation aligned with the project’s needs.

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

[Haroldwonder]

@Haroldwonder has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I would like to work on this

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

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Congratulations, @Haroldwonder! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

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