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DORA Metrics

Module

Telemetry

Status

IMPLEMENTED

Description

DORA (DevOps Research and Assessment) metrics implementation tracking the four key metrics: Deployment Frequency, Lead Time for Changes, Change Failure Rate, and Mean Time to Recovery (MTTR), with SLO breach tracking and performance classification.

Implementation Details

  • DoraMetrics: src/Telemetry/StellaOps.Telemetry.Core/StellaOps.Telemetry.Core/DoraMetrics.cs -- OpenTelemetry meter StellaOps.DORA with counters for deployments, successes, failures, incidents, resolutions, and histograms for deployment duration, lead time, and MTTR; includes SLO breach counter and performance level classification (Elite/High/Medium/Low/Unknown)
  • DoraMetricsModels: src/Telemetry/StellaOps.Telemetry.Core/StellaOps.Telemetry.Core/DoraMetricsModels.cs -- DoraMetricsOptions, DoraPerformanceLevel enum, DoraDeploymentOutcome enum, DoraIncidentSeverity enum, DoraDeploymentEvent record, DoraIncidentEvent record, DoraSummary record
  • IDoraMetricsService: src/Telemetry/StellaOps.Telemetry.Core/StellaOps.Telemetry.Core/IDoraMetricsService.cs -- service interface for recording deployments, incidents, resolving incidents, getting summaries, and querying events
  • InMemoryDoraMetricsService: src/Telemetry/StellaOps.Telemetry.Core/StellaOps.Telemetry.Core/InMemoryDoraMetricsService.cs -- in-memory implementation with per-tenant isolation, median lead time calculation, CFR computation, MTTR aggregation, and environment-level filtering
  • DI Registration: src/Telemetry/StellaOps.Telemetry.Core/StellaOps.Telemetry.Core/TelemetryServiceCollectionExtensions.cs -- AddDoraMetrics() extension method registering DoraMetrics, IDoraMetricsService, and IOutcomeAnalyticsService
  • Tests: src/Telemetry/StellaOps.Telemetry.Core/StellaOps.Telemetry.Core.Tests/DoraMetricsTests.cs (11 test cases), DoraMetricsServiceTests.cs (11 test cases)
  • Source: Feature matrix scan + QA verification

Verified Behaviors

  • Deployment recording emits dora_deployments_total, dora_deployment_success_total, dora_deployment_duration_seconds, dora_lead_time_hours
  • Rollback/hotfix/failed outcomes emit dora_deployment_failure_total
  • Lead time SLO breach emits dora_slo_breach_total with metric=lead_time tag
  • MTTR SLO breach emits dora_slo_breach_total with metric=mttr tag
  • Incident tracking with start/resolution lifecycle
  • Performance classification across all four DORA levels
  • Summary calculation with deployment frequency, CFR, median lead time, MTTR
  • Per-tenant and per-environment isolation

QA Notes

  • Bug fix applied: DoraMetricsTests._measurements changed from List<> to ConcurrentBag<> to fix race condition in MeterListener callbacks