Quality Metrics

<default_to_action> When measuring quality or building dashboards:

• MEASURE outcomes (bug escape rate, MTTD) not activities (test count)

• FOCUS on DORA metrics: Deployment frequency, Lead time, MTTD, MTTR, Change failure rate

• AVOID vanity metrics: 100% coverage means nothing if tests don't catch bugs

• SET thresholds that drive behavior (quality gates block bad code)

• TREND over time: Direction matters more than absolute numbers

Quick Metric Selection:

• Speed: Deployment frequency, lead time for changes

• Stability: Change failure rate, MTTR

• Quality: Bug escape rate, defect density, test effectiveness

• Process: Code review time, flaky test rate

Critical Success Factors:

• Metrics without action are theater

• What you measure is what you optimize

• Trends matter more than snapshots </default_to_action>

Quick Reference Card

When to Use

• Building quality dashboards

• Defining quality gates

• Evaluating testing effectiveness

• Justifying quality investments

Meaningful vs Vanity Metrics

✅ Meaningful ❌ Vanity

Bug escape rate Test case count

MTTD (detection) Lines of test code

MTTR (recovery) Test executions

Change failure rate Coverage % (alone)

Lead time for changes Requirements traced

DORA Metrics

Metric Elite High Medium Low

Deploy Frequency On-demand Weekly Monthly Yearly

Lead Time < 1 hour < 1 week < 1 month

6 months

Change Failure Rate < 5% < 15% < 30%

45%

MTTR < 1 hour < 1 day < 1 week

1 month

Quality Gate Thresholds

Metric Blocking Threshold Warning

Test pass rate 100%

Critical coverage

80% 70%

Security critical 0

Performance p95 < 200ms < 500ms

Flaky tests < 2% < 5%

Core Metrics

Bug Escape Rate

Bug Escape Rate = (Production Bugs / Total Bugs Found) × 100

Target: < 10% (90% caught before production)

Test Effectiveness

Test Effectiveness = (Bugs Found by Tests / Total Bugs) × 100

Target: > 70%

Defect Density

Defect Density = Defects / KLOC

Good: < 1 defect per KLOC

Mean Time to Detect (MTTD)

MTTD = Time(Bug Reported) - Time(Bug Introduced)

Target: < 1 day for critical, < 1 week for others

Dashboard Design

// Agent generates quality dashboard await Task("Generate Dashboard", { metrics: { delivery: ['deployment-frequency', 'lead-time', 'change-failure-rate'], quality: ['bug-escape-rate', 'test-effectiveness', 'defect-density'], stability: ['mttd', 'mttr', 'availability'], process: ['code-review-time', 'flaky-test-rate', 'coverage-trend'] }, visualization: 'grafana', alerts: { critical: { bug_escape_rate: '>20%', mttr: '>24h' }, warning: { coverage: '<70%', flaky_rate: '>5%' } } }, "qe-quality-analyzer");

Quality Gate Configuration

{ "qualityGates": { "commit": { "coverage": { "min": 80, "blocking": true }, "lint": { "errors": 0, "blocking": true } }, "pr": { "tests": { "pass": "100%", "blocking": true }, "security": { "critical": 0, "blocking": true }, "coverage_delta": { "min": 0, "blocking": false } }, "release": { "e2e": { "pass": "100%", "blocking": true }, "performance_p95": { "max_ms": 200, "blocking": true }, "bug_escape_rate": { "max": "10%", "blocking": false } } } }

Agent-Assisted Metrics

// Calculate quality trends await Task("Quality Trend Analysis", { timeframe: '90d', metrics: ['bug-escape-rate', 'mttd', 'test-effectiveness'], compare: 'previous-90d', predictNext: '30d' }, "qe-quality-analyzer");

// Evaluate quality gate await Task("Quality Gate Evaluation", { buildId: 'build-123', environment: 'staging', metrics: currentMetrics, policy: qualityPolicy }, "qe-quality-gate");

Agent Coordination Hints

Memory Namespace

aqe/quality-metrics/ ├── dashboards/* - Dashboard configurations ├── trends/* - Historical metric data ├── gates/* - Gate evaluation results └── alerts/* - Triggered alerts

Fleet Coordination

const metricsFleet = await FleetManager.coordinate({ strategy: 'quality-metrics', agents: [ 'qe-quality-analyzer', // Trend analysis 'qe-test-executor', // Test metrics 'qe-coverage-analyzer', // Coverage data 'qe-production-intelligence', // Production metrics 'qe-quality-gate' // Gate decisions ], topology: 'mesh' });

Common Traps

Trap Problem Solution

Coverage worship 100% coverage, bugs still escape Measure bug escape rate instead

Test count focus Many tests, slow feedback Measure execution time

Activity metrics Busy work, no outcomes Measure outcomes (MTTD, MTTR)

Point-in-time Snapshot without context Track trends over time

Related Skills

• agentic-quality-engineering - Agent coordination

• cicd-pipeline-qe-orchestrator - Quality gates

• risk-based-testing - Risk-informed metrics

• shift-right-testing - Production metrics

Remember

Measure outcomes, not activities. Bug escape rate > test count. MTTD/MTTR > coverage %. Trends > snapshots. Set gates that block bad code. What you measure is what you optimize.

With Agents: Agents track metrics automatically, analyze trends, trigger alerts, and make gate decisions. Use agents to maintain continuous quality visibility.