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- Validate pool configuration after changes applied - Automatic rollback if config validation fails - Verify PHP-FPM restarted successfully and is accepting connections - Verify new configuration actually loaded into memory - Automatic rollback if PHP-FPM doesn't start after changes - Provides safety checks to prevent broken configurations - Better error handling and recovery options Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>