feat(maru): add Prometheus observability metrics to MaruBackend#8
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hyunyul-XCENA wants to merge 2 commits into
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feat(maru): add Prometheus observability metrics to MaruBackend#8hyunyul-XCENA wants to merge 2 commits into
hyunyul-XCENA wants to merge 2 commits into
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Add 6 self-contained Prometheus metrics using prometheus_client directly, with zero changes to LMCache core observability modules: - maru_put_task_num (Gauge): in-flight put tasks - maru_put_failed_count (Counter): store RPC failures - maru_get_blocking_failed_count (Counter): retrieve failures - maru_alloc_failed_count (Counter): CXL memory allocation failures - maru_store_latency_seconds (Histogram): store RPC latency - maru_retrieve_latency_seconds (Histogram): CXL read latency Metrics are exposed via vLLM /metrics endpoint when PROMETHEUS_MULTIPROC_DIR is set. Gauge uses multiprocess_mode and set_function for zero runtime overhead.
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Summary
maru_backend.py/metricsendpoint withPROMETHEUS_MULTIPROC_DIRMetrics
lmcache:maru_put_task_numlmcache:maru_put_failed_countlmcache:maru_get_blocking_failed_countlmcache:maru_alloc_failed_countlmcache:maru_store_latency_secondslmcache:maru_retrieve_latency_secondsTest plan
curl localhost:$PORT/metrics | grep lmcache:maru