c97f12d47e
Complete Prometheus instrumentation for OAuth token operations and additional database operations to populate empty dashboard panels. OAuth Token Metrics (Phase 4): - unified_verifier.py: * Token validation cache hits/misses * JWT verification success/failure/error * Introspection validation results * Audience validation failures - context_helper.py: * Token exchange cache hits/misses * RFC 8693 exchange success/error Database Metrics (Phase 3 completion): - storage.py: * get_refresh_token() with timing * delete_refresh_token() with timing * All operations record duration and success/error status These metrics populate the following dashboard panels: - Token Validations (by method and result) - Token Cache Hit Rate - Token Exchange Operations - Database Operations (refresh token CRUD) - Database Operation Duration Part of PR #295 - Complete metrics instrumentation