can ceph_exporter support getting rbd info? about ceph_exporter HOT 4 CLOSED

ceph_exporter uses the go-ceph (https://github.com/ceph/go-ceph) library which does have an rbd client.
Looking at the code (https://github.com/ceph/go-ceph/blob/master/rbd/rbd.go#L297-L317) it seems that there is a Stat() function that provides a size, an object size and a number of objects.
Are these metrics actually relevant?

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@cristicalin
we want to monitor the used size of an image, so as to resize the images if the available size is not enough.
the code is not right for us, but thank you all the same

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@fffffreedom @cristicalin I'm currently working on usage tracking by using rbd_diff_iterate2. But I would suggest to add a seperated metrics path e.g /rbdmetrics to specify a lower scrape ratio. Next day's i'll open a pull request for go-ceph. Another alternative is to parameterize the metric collectors to and enable the rbd collector by default.

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As mentioned above this doesn't really fit ceph exporter but is better suited for custom tooling using go-ceph.

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