[Optimization] Enhance obs module telemetry.rs with environment-aware logging and production security (#539)

* Initial plan

* Implement environment-aware logging with production stdout auto-disable

Co-authored-by: houseme <4829346+houseme@users.noreply.github.com>

* add mimalloc crate

* fix

* improve code

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: houseme <4829346+houseme@users.noreply.github.com>
Co-authored-by: houseme <housemecn@gmail.com>
Co-authored-by: loverustfs <155562731+loverustfs@users.noreply.github.com>

crates/obs/README.md

@@ -21,12 +21,57 @@
 
 ## ✨ Features
 
+- **Environment-Aware Logging**: Automatically configures logging behavior based on deployment environment
+  - Production: File-only logging (stdout disabled by default for security and log aggregation)
+  - Development/Test: Full logging with stdout support for debugging
 - OpenTelemetry integration for distributed tracing
 - Prometheus metrics collection and exposition
-- Structured logging with configurable levels
+- Structured logging with configurable levels and rotation
 - Performance profiling and analytics
 - Real-time health checks and status monitoring
 - Custom dashboards and alerting integration
+- Enhanced error handling and resilience
+
+## 🚀 Environment-Aware Logging
+
+The obs module automatically adapts logging behavior based on your deployment environment:
+
+### Production Environment
+```bash
+# Set production environment - disables stdout logging by default
+export RUSTFS_OBS_ENVIRONMENT=production
+
+# All logs go to files only (no stdout) for security and log aggregation
+# Enhanced error handling with clear failure diagnostics
+```
+
+### Development/Test Environment
+```bash
+# Set development environment - enables stdout logging
+export RUSTFS_OBS_ENVIRONMENT=development
+
+# Logs appear both in files and stdout for easier debugging
+# Full span tracking and verbose error messages
+```
+
+### Configuration Override
+You can always override the environment defaults:
+```rust
+use rustfs_obs::OtelConfig;
+
+let config = OtelConfig {
+    endpoint: "".to_string(),
+    use_stdout: Some(true), // Explicit override - forces stdout even in production
+    environment: Some("production".to_string()),
+    ..Default::default()
+};
+```
+
+### Supported Environment Values
+- `production` - Secure file-only logging
+- `development` - Full debugging with stdout
+- `test` - Test environment with stdout support  
+- `staging` - Staging environment with stdout support
 
 ## 📚 Documentation