These versioning guidlines are for Integrations under the Integrations section only and do not apply to Pluralsight's GraphQL API found under the Documention and Getting Started sections.
Bug Fixes, Minor Changes, Security Patches
Changes are thoroughly tested, then rolled out to everyone at once.
Most new functionality (that is not a breaking change), will be optional and be supported as such. For example, through a flag that you could choose to enable if it fits your needs.
Any changes that would break current functionality would occur through a new version of the integration. Older versions will be supported for a time to allow for everyone to move to the new version as soon as they are able.