API GATEWAY COVERAGE DISTRIBUTION
==================================

OVERALL: 18.95% Line Coverage (1,310/6,914 lines)

COVERAGE TIERS:
===============

█████████░ 100% Coverage (1 module - 62 lines)
├─ auth/mfa/verification.rs ✅

████████░░  80-99% Coverage (4 modules - 462 lines)
├─ auth/mfa/enrollment.rs (93.26%)
├─ config/validator.rs (90.69%)
├─ auth/mfa/totp.rs (88.56%)
└─ auth/mfa/qr_code.rs (86.96%)

████░░░░░░  40-79% Coverage (5 modules - 908 lines)
├─ grpc/server.rs (72.88%)
├─ metrics/exporter.rs (57.97%)
├─ auth/mfa/backup_codes.rs (57.36%)
├─ auth/interceptor.rs (56.50%)
└─ grpc/backtesting_proxy.rs (42.20%)

██░░░░░░░░  20-39% Coverage (2 modules - 408 lines)
├─ routing/rate_limiter.rs (31.62%)
└─ grpc/trading_proxy.rs (20.00%)

█░░░░░░░░░  1-19% Coverage (2 modules - 474 lines)
├─ config/authz.rs (7.96%)
└─ auth/mfa/mod.rs (4.03%)

░░░░░░░░░░  0% Coverage (10 modules - 1,163 lines)
├─ metrics/auth_metrics.rs (0/189)
├─ metrics/proxy_metrics.rs (0/189)
├─ config/manager.rs (0/199)
├─ metrics/config_metrics.rs (0/99)
├─ config/endpoints.rs (0/40)
├─ metrics/mod.rs (0/18)
└─ [config crate files - expected 0%]

PRIORITY TARGETS:
=================

1. 🔴 CRITICAL (Security/Core):
   - auth/mfa/mod.rs: 4% → 80% (+262 lines)
   - config/authz.rs: 8% → 80% (+185 lines)
   
2. 🟠 HIGH (Infrastructure):
   - metrics/*: 0% → 60% (+477 lines)
   - config/manager.rs: 0% → 60% (+199 lines)
   
3. 🟡 MEDIUM (Performance):
   - routing/rate_limiter.rs: 32% → 80% (+173 lines)
   - grpc/trading_proxy.rs: 20% → 80% (+124 lines)

FAILING TESTS:
==============
❌ auth::mfa::totp::tests::test_constant_time_compare
   Issue: Security bug in empty string handling
   
❌ grpc::trading_proxy::tests::test_circuit_breaker_check
   Issue: Missing Tokio runtime wrapper

EFFORT ESTIMATE:
================
To reach 95% overall coverage:
- Lines to add: ~5,600
- Tests to write: ~200-300
- Estimated hours: 15-20
- Priority modules: 6 (1,396 lines total)

PATH TO 95%:
============
Current:  18.95% ████░░░░░░░░░░░░░░░░
Target:   95.00% ███████████████████░
Gap:      76.05% ███████████████░░░░░