@@ -186,12 +186,72 @@ GET /bucket?uploads → ListMultipartUploads
186186GET /bucket/key?uploadId=X → ListParts
187187```
188188
189- ### Phase 7: Operations & Observability ⚠️ NEXT PHASE
190- - [ ] Garbage collection for orphan blobs
191- - [ ] Prometheus metrics
192- - [ ] Health check endpoints
193- - [ ] Request tracing
194- - [ ] Rate limiting
189+ ### Phase 7: Operations & Observability ✅ COMPLETED
190+ - [x] Garbage collection for orphan blobs - ` internal/service/gc_service.go `
191+ - [x] Prometheus metrics - ` internal/metrics/metrics.go `
192+ - [x] Health check endpoints - ` internal/handler/health.go `
193+ - [x] Request tracing - ` internal/middleware/tracing.go `
194+ - [x] Rate limiting - ` internal/middleware/ratelimit.go `
195+
196+ ** Implementation Details:**
197+
198+ ** Garbage Collection:**
199+ - Automatic background GC with configurable interval (default: 1 hour)
200+ - Grace period prevents deleting blobs during active uploads (default: 24 hours)
201+ - Batch processing with configurable size (default: 1000 blobs per run)
202+ - Dry run mode for testing without actual deletion
203+ - Tracks orphan blobs (ref_count = 0) and cleans up both DB and storage
204+
205+ ** Prometheus Metrics:**
206+ - Separate metrics server on configurable port (default: 9091)
207+ - HTTP request metrics: total, duration, in-flight, response size
208+ - Storage metrics: operations, duration, bytes transferred
209+ - Auth metrics: attempts, failures with reasons
210+ - GC metrics: runs, blobs deleted, bytes freed, duration
211+ - Rate limiting metrics: requests limited by type
212+
213+ ** Health Endpoints:**
214+ ```
215+ GET /health → Full component health with latency
216+ GET /healthz → Kubernetes liveness probe
217+ GET /readyz → Kubernetes readiness probe
218+ ```
219+ - Component-level status (database, storage)
220+ - Cached responses for efficiency (default: 5s TTL)
221+ - Status levels: healthy, degraded, unhealthy
222+
223+ ** Request Tracing:**
224+ - Automatic request ID generation (X-Request-ID header)
225+ - Trace ID propagation for distributed tracing
226+ - S3-compatible headers (x-amz-request-id, x-amz-id-2)
227+ - Structured logging with request context
228+ - Path normalization for low-cardinality metrics
229+
230+ ** Rate Limiting:**
231+ - Token bucket algorithm per client IP
232+ - Configurable rate (default: 100 req/s) and burst (default: 200)
233+ - S3-compatible SlowDown error response
234+ - Automatic bucket cleanup for stale clients
235+ - Optional bandwidth limiting support
236+
237+ ** Configuration:**
238+ ``` yaml
239+ metrics :
240+ enabled : true
241+ port : 9091
242+ path : /metrics
243+
244+ rate_limit :
245+ enabled : true
246+ requests_per_second : 100
247+ burst_size : 200
248+
249+ gc :
250+ enabled : true
251+ interval : 1h
252+ grace_period : 24h
253+ batch_size : 1000
254+ ` ` `
195255
196256### Phase 8: Architecture Improvements (Community Requested)
197257> **Community Feedback**: "PostgreSQL + Redis is overkill for single-node deployments."
@@ -206,6 +266,8 @@ GET /bucket/key?uploadId=X → ListParts
206266- [ ] Cross-region replication
207267- [ ] Server-side encryption
208268- [ ] Object locking (WORM)
269+ - [ ] WEB Dashboard (webui)
270+ - [ ] Python and PHP sdk
209271
210272---
211273
@@ -408,13 +470,13 @@ Path: /data/ab/cd/abcdef1234567890...
408470## Section 4: Current Context
409471
410472### Active Development Phase
411- ** Phase 7: Operations & Observability **
473+ **Phase 8: Architecture Improvements **
412474
413475### Current Task
414- Planning next phase: Garbage collection, metrics, health checks
476+ Planning next phase: Embedded database support, single-node optimization
415477
416478### Last Updated
417- 2025-01-08
479+ 2025-12-04
418480
419481### Completed Phases
420482- ✅ Phase 1: Core Infrastructure
@@ -423,20 +485,26 @@ Planning next phase: Garbage collection, metrics, health checks
423485- ✅ Phase 4: Object Operations
424486- ✅ Phase 5: Versioning
425487- ✅ Phase 6: Multipart Upload
488+ - ✅ Phase 7: Operations & Observability
426489
427490### Files Modified This Session
428- - ` internal/service/multipart_service.go ` - Complete multipart upload service
429- - ` internal/service/multipart_service_test.go ` - Unit tests (15 tests passing)
430- - ` internal/handler/multipart_handler.go ` - HTTP handlers with S3 XML responses
431- - ` internal/handler/router.go ` - Multipart upload routing
432- - ` cmd/alexander-server/main.go ` - Wired MultipartService and MultipartHandler
433- - ` MEMORY_BANK.md ` - Updated with Phase 6 completion
491+ - `internal/metrics/metrics.go` - Prometheus metrics definitions
492+ - `internal/middleware/ratelimit.go` - Token bucket rate limiting
493+ - `internal/middleware/tracing.go` - Request tracing and correlation IDs
494+ - `internal/service/gc_service.go` - Garbage collection service
495+ - `internal/handler/health.go` - Enhanced health check endpoints
496+ - `internal/handler/router.go` - Integrated new middleware
497+ - `internal/config/config.go` - Added metrics, rate_limit, gc config sections
498+ - `internal/storage/interfaces.go` - Added HealthCheck method
499+ - `internal/storage/filesystem/storage.go` - Implemented HealthCheck
500+ - `internal/storage/errors.go` - Added IsNotFound helper
501+ - `cmd/alexander-server/main.go` - Wired GC, metrics server, middleware
502+ - `MEMORY_BANK.md` - Updated with Phase 7 completion
434503
435504### Pending Tasks
436- 1 . Garbage collection for orphan blobs (Phase 7)
437- 2 . Prometheus metrics (Phase 7)
438- 3 . Health check endpoints (Phase 7)
439- 4 . Add embedded database option (Phase 8)
505+ 1. Embedded database support (SQLite/BadgerDB) - Phase 8
506+ 2. Memory-based locking for single-node mode - Phase 8
507+ 3. Single binary deployment mode - Phase 8
440508
441509### Known Issues
442510None currently.
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