VMware snapshots aren't cleaned up by VMware-Snapshot feature.

Originally reported in NAS-104116 and then in NAS-104542.

It still doesn't work for me. FreeNAS keeps adding snapshots without deleting them. The only thing found in middleware.d is a warning related to a VM that cannot be snapshotted.

Thanks,

Natale.

[2020/03/09 00:00:00] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.PeriodicSnapshotTaskStart object at 0x83a17c450>
[2020/03/09 00:01:00] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.PeriodicSnapshotTaskSuccess object at 0x83a1b44d0>
[2020/03/09 00:01:00] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskStart object at 0x83a19da10>
[2020/03/09 00:01:00] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <middlewared.plugins.zettarepl.ReplicationTaskLog object at 0x83a1dbf50>
[2020/03/09 00:01:00] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <middlewared.plugins.zettarepl.ReplicationTaskLog object at 0x83a1dbdd0>
[2020/03/09 00:01:00] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <middlewared.plugins.zettarepl.ReplicationTaskLog object at 0x83a193f50>
[2020/03/09 00:01:00] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotStart object at 0x83a1938d0>
[2020/03/09 00:01:10] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x83a18ab50>
[2020/03/09 00:01:20] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x837cedf90>
[2020/03/09 00:01:21] (INFO) VMWareService.snapshot_begin():473 - Can't snapshot VM backup-vms that depends on datastore datastore01 and filesystem data/vms/datastore-01. Possibly using PT devices. Skipping.
[2020/03/09 00:01:21] (WARNING) aiohttp.websocket._send_frame():565 - websocket connection is closing.
[2020/03/09 00:01:30] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x837d368d0>
[2020/03/09 00:01:41] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x83a146050>
[2020/03/09 00:01:51] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x835b60e50>
[2020/03/09 00:02:01] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x83a13a250>
[2020/03/09 00:02:11] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x83a0f4810>
[2020/03/09 00:02:21] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x83a13add0>
[2020/03/09 00:02:31] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x839a945d0>
[2020/03/09 00:02:41] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x83a13acd0>
[2020/03/09 00:02:51] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x835b60e50>
[2020/03/09 00:03:01] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x83a1518d0>
[2020/03/09 00:03:12] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x83a151290>
[2020/03/09 00:03:22] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x83a19da90>
[2020/03/09 00:03:32] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x83a151310>
[2020/03/09 00:03:42] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotProgress object at 0x83a19da50>
[2020/03/09 00:03:54] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSnapshotSuccess object at 0x83a151710>
[2020/03/09 00:03:54] (DEBUG) ZettareplService._observer_queue_reader():684 - Observer queue got <zettarepl.observer.ReplicationTaskSuccess object at 0x83a151090>