Add Prometheus metrics endpoint with custom business metrics

[nanaf6203-bit]

Problem

The MetricsModule exists but has no custom business metrics beyond default Node.js metrics.

Expected Outcome

Comprehensive Prometheus metrics endpoint with default and custom metrics.

Acceptance Criteria

• HTTP request metrics: count, latency (p50/p95/p99), error rate
• Business metrics: registrations, logins, transactions, properties
• Database metrics: query counts, pool utilization
• History histograms configured for real estate use case

Files Affected

src/metrics/metrics.module.ts, src/metrics/metrics.controller.ts, various services

Difficulty

Medium

Estimated Effort

Medium (1 week)

Labels

observability, monitoring, enhancement

[a34722429-alt]

@a34722429-alt has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

i would like to work on this issue please

ℹ️ Repo Maintainers: To accept this application, review their application or assign @a34722429-alt to this issue.

[JudeDaniel6]

@JudeDaniel6 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello Maintainer,please can I work on this issue and give you a better result

ℹ️ Repo Maintainers: To accept this application, review their application or assign @JudeDaniel6 to this issue.

[drips-wave]

Congratulations, @JudeDaniel6! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @JudeDaniel6: 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

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