Addresses issue #861 - syslog flooded on docker host
Many routine operational messages were being logged at INFO level,
causing excessive log volume when monitoring multiple VMs/containers.
These messages are now logged at DEBUG level:
- Guest threshold checking (every guest, every poll cycle)
- Storage threshold checking (every storage, every poll cycle)
- Host agent linking messages
- Filesystem inclusion in disk calculation
- Guest agent disk usage replacement
- Polling start/completion messages
- Alert cleanup and save messages
Users can set LOG_LEVEL=debug to see these messages if needed for
troubleshooting. The default INFO level now produces significantly
less log output.
Also updated documentation in CONFIGURATION.md and DOCKER.md to:
- Clarify what each log level includes
- Add tip about using LOG_LEVEL=warn for minimal logging
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