What

Update monitoring_system-config.cmake.in to match ecosystem conventions established by database_system, network_system, and container_system config templates.

Current State

The config template has complete find_dependency() coverage but lacks several consistency features present in sibling libraries.

Gaps vs. Ecosystem Standard

Why

• Consumers using _FOUND/_LIBRARIES pattern (common in legacy CMake) cannot discover monitoring_system
• Temporary variables (MONITORING_USE_THREAD_SYSTEM, etc.) leak into consumer CMake scope
• Missing status message makes build log debugging harder
• Ecosystem should present a uniform find_package experience across all 8 libraries

Where

• cmake/monitoring_system-config.cmake.in

How

Technical Approach

1. Add header comment documenting exported targets (monitoring_system::monitoring, etc.)
2. Add compatibility variables: monitoring_system_FOUND, monitoring_system_INCLUDE_DIRS, monitoring_system_LIBRARIES
3. Add legacy namespace aliases: MonitoringSystem::monitoring → monitoring_system::monitoring
4. Add message(STATUS "Found monitoring_system ${monitoring_system_VERSION}")
5. Add unset() for temporary variables (MONITORING_USE_THREAD_SYSTEM, MONITORING_USE_LOGGER_SYSTEM, MONITORING_USE_NETWORK_SYSTEM, MONITORING_USE_GRPC)

Acceptance Criteria

• Config template includes header comment with target documentation
• monitoring_system_FOUND, _INCLUDE_DIRS, _LIBRARIES set correctly
• Legacy MonitoringSystem:: aliases created
• Status message printed on successful find
• Temporary variables cleaned up with unset()
• find_package(monitoring_system CONFIG) still works correctly

Related

• Part of Ecosystem vcpkg distribution readiness improvements common_system#531