Initial distributed tracing instrumentation #48
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frzifus
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Implement custom tracing spans for observability into cache operations Changes: - Add OpenTelemetry SDK dependencies to go.mod - Create pkg/telemetry package with InitTracing() for setup - Add three custom spans to pkg/kvcache/indexer.go: * kvcache.manager.get_scores (SERVER): Main GetPodScores operation * kvcache.storage.lookup (INTERNAL): KV block index lookup * kvcache.scorer.compute (INTERNAL): Scoring algorithm execution - Instrument with attributes: * Model identifier, pod counts, block counts * Cache hit ratios and score distributions * Timing via automatic span duration tracking Key metrics captured: - kvcache.hit_ratio: Cache effectiveness (0.0-1.0) - kvcache.total_blocks_available: Available blocks across pods - kvcache.score.max/avg: Score distribution insights - kvcache.lookup.cache_hit: Whether blocks were found Security: Metadata-only tracing (no prompts, tokens, or sensitive data) Co-Authored-By: Claude <[email protected]> Signed-off-by: sallyom <[email protected]>
Signed-off-by: sallyom <[email protected]>
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Initial distributed tracing instrumentation
Also, fix nil pointer dereference in KV Cache scorer initialization.