distro_ver too short for HardenedBSD

HardenedBSD (security hardened variant of FreeBSD) reports distro_ver as 17 character string:

14.0-CURRENT-HBSD

This causes Observium event log to fill up with following repeating entries:

Distro_ver changed: '14.0-CURRENT-HBS' -> '14.0-CURRENT-HBSD'

This continous distro_ver change detection is caused by distro_ver being declared and stored as 16-character VARCHAR:

`distro_ver` varchar(16) COLLATE utf8_unicode_ci DEFAULT NULL

Would it be possible to alter distro_ver in schema to be bit longer than 16-characters to accomodate HardenedBSD and other OSs that report longer version identifiers?