Add per-endpoint SLA metrics and percentile latency tracking

[Baskarayelu]

Add per-endpoint SLA metrics and percentile latency tracking

Description

• Emit endpoint-level latency and error metrics suitable for SLO dashboards.

Requirements and context

• Capture p50/p95/p99 latency and error-rate dimensions by route/method.
• Exclude health probes from SLA metrics.

Suggested execution

• Add middleware timing instrumentation and metrics tags.
• Update metric registry with endpoint naming normalization.

Test and commit

• Add tests for metric emission and label consistency.

Example commit message

• chore(metrics): add per-endpoint latency percentiles and error rates

Guidelines

• Keep label cardinality bounded.
• Align metric names with current observability conventions.

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[iyanumajekodunmi756]

@iyanumajekodunmi756 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

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