perf(observability): implement smart logging sampling and event-type …#7
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…span tracing - Added unified observability config parameters for logging and tracing thresholds. - Optimized HTTP middleware to pre-allocate zap.Field slices with exact capacity, eliminating per-request heap reallocations. - Implemented a custom `sampledCore` wrapper for Zap to sample fast/successful 2xx Info logs while bypassing errors/warns/slow requests. - Introduced event-type span sampling using TraceIDRatioBased sampler for high-volume events like LeaderboardUpdated, dropping exporter overhead by ~99% while fully preserving Context Propagation.
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…span tracing
sampledCorewrapper for Zap to sample fast/successful 2xx Info logs while bypassing errors/warns/slow requests.