Please refer to the release notes at https://github.com/vmware/open-vm-tools/blob/stable-12.2.0/ReleaseNotes.md
The granular changes that have gone into the 12.2.0 release are in the ChangeLog at https://github.com/vmware/open-vm-tools/blob/stable-12.2.0/open-vm-tools/ChangeLog
There are no new features in the open-vm-tools 12.2.0 release. This is primarily a maintenance release that addresses a few critical problems, including:
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Linux quiesced snapshots have been updated to avoid intermittent hangs of the vmtoolsd process.
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Updated the guestOps to handle some edge cases when File_GetSize() fails or returns -1.
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A number of Coverity reported issues have been addressed.
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Detect the proto files for the containerd grpc client in alternate locations.
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FreeBSD: Support newer releases and code clean-up for earlier versions.
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For issues resolved in this release, see the Resolved Issues section of the Release Notes.