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feat(observability): scan stage histograms, analyzer saturation, failure taxonomy, and throughput dashboard - #1281
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…ure taxonomy, and throughput dashboard - Issue MDTechLabs#1259: Add scan stage duration histograms with configurable buckets - Issue MDTechLabs#1260: Expose analyzer saturation and queue pressure metrics - Issue MDTechLabs#1261: Create structured scan failure taxonomy with retryable classification - Issue MDTechLabs#1264: Add operational dashboard for scan throughput and files-per-second metrics Closes MDTechLabs#1259, Closes MDTechLabs#1260, Closes MDTechLabs#1261, Closes MDTechLabs#1264
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Summary
This PR resolves issues #1259, #1260, #1261, and #1264 with end-to-end observability implementations:
Scan Stage Duration Histograms (Closes Add scan stage duration histograms #1259):
ScanStageHistogramServicetracking millisecond latency distributions across all scan pipeline stages (queue,validation,bytecode_analysis,simulation,report_generation).Analyzer Saturation & Queue Pressure Metrics (Closes Expose analyzer saturation and queue pressure metrics #1260):
AnalyzerSaturationMetricsServicecapturing queue length, active concurrency, worker capacity utilization percentage, and saturation status flags.Structured Scan Failure Taxonomy (Closes Create structured scan failure taxonomy #1261):
ScanFailureTaxonomyServiceclassifying failures into standard categories (BYTECODE_INVALID,RPC_TIMEOUT,SIMULATION_REVERT,RATE_LIMITED,ANALYZER_CRASH, etc.) with severity levels, retryability classifications, and remediation hints.Operational Dashboard for Scan Throughput (Closes Add operational dashboard for scan throughput #1264):
ScanThroughputDashboardServiceaggregating completed, failed, and in-flight scans across sliding time windows (1m, 5m, 15m, 1h).HEALTHY,DEGRADED,CRITICAL).Issues Addressed