no utilization stats for SSD journals

[bengland2]

For non-collocated OSDs, it would be nice to graph I/O on the journal devices. We might not want to put SSD devices in same graph as HDD devices for a IOPS or transfer rate graph, but it would be really useful to see utilization - i.e. are the SSDs over/undersubscribed?

[pcuzner]

The journal stats are stored in graphite - I just don't currently expose them in a chart :) To get the journal device; for filestore I follow the journal link and for bluestore the wal link (if it's split out)

I'll flag this as an enhancement request - where would you expect to see this data presented (which dashboard)?