E-Series Free Pool Space Monitoring

We have released a new monitoring plugin called check_eseries_pool. The first version has exactly one subcommand called free-space. This monitors the free space still available for thin volumes in the disk pool. It is particularly useful when you start taking snapshots or mirroring to another system. In such cases, you will monitor the FreePoolSpace to track the changes until they are mirrored to the other system or until the snapshot is deleted.
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