This pull request introduces several improvements and refactorings to the agent-manager and agent components, with a focus on reliability, port standardization, dependency management, and enhanced NetFlow support. The most significant changes include updating network ports for gRPC and HTTP services, adding error-handling delays before process termination, and a major refactor of the NetFlow module to support additional NetFlow versions using the goflow2 library.

Network Port Updates and Service Standardization

• Changed gRPC and HTTP server ports in both agent-manager and related workflow/Docker files: gRPC now listens on port 9000 (was 50051), and HTTP on 9001 (was 8080), updating all relevant code, logs, and Dockerfile EXPOSE statements for consistency. (.github/workflows/installer-release.yml, agent-manager/Dockerfile, agent-manager/agent/utmgrpc.go, agent-manager/updates/updates.go) [1] [2] [3] [4] [5]

Reliability and Error Handling Improvements

• Added time.Sleep(5 * time.Second) before process exit on critical errors (e.g., database migration, service initialization, collector fetch, gRPC server failures) to ensure error logs are flushed and visible in logs before shutdown. (agent-manager/main.go, agent-manager/agent/collector_imp.go, agent-manager/agent/utmgrpc.go) [1] [2] [3] [4] [5]

NetFlow Module Enhancements

• Refactored the NetFlow module to support additional NetFlow versions (v5, v9, IPFIX) using the goflow2 library, while maintaining legacy support for older versions via tehmaze/netflow. Introduced a new templateSystem for managing NetFlow templates, and added thread safety via mutexes. Increased UDP buffer size for improved packet handling. (agent/modules/netflow.go, agent/go.mod) [1] [2] [3] [4] [5]

Dependency and Module Management

• Updated and reorganized Go module dependencies for both agent and agent-manager, including upgrades (e.g., threatwinds/go-sdk to v1.1.8), and added github.com/netsampler/goflow2 to agent for NetFlow enhancements. (agent-manager/go.mod, agent/go.mod) [1] [2] [3] [4] [5]

Agent Usability and Robustness

• Improved the uninstall process in the agent to attempt stopping the updater service first, with clear user feedback and a short delay to ensure proper sequencing. (agent/main.go)
• Increased wait times (from 100ms to 200ms) when toggling TLS/port status in modules for more robust hot-reload behavior. (agent/modules/configuration.go, agent/modules/modules.go) [1] [2] [3] [4] [5]