versionId property
A lower-case string identifying the operating system version, excluding any OS name information or release code name, and suitable for processing by scripts or usage in generated filenames.
The version is mostly numeric, and contains no spaces or other characters outside of 0–9, a–z, '.', '_' and '-'.
Examples: '17', '11.04'.
This field is optional and may be null on some systems.
Implementation
final String? versionId;