Performance Alert Plugin not handling removable SRs correctly
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 I had turned of my perf-alert plugin some time ago do an issue in XO. Unfortunately, I can't find the thread regarding the issue so I don't recall the details. Since it's been some time, I decided to turn it back on and see if things were fixed. I was immediately spammed with email alerts stating that my DVD Drives were at 100% utilization as well as end of alert emails stating that my Removable Storage was at NaN% utilization. I have All SRs checked and I checked Exclude SRs but the DVD Drives and Removable Storage don't show up in the list for me to exclude. Looking at my Storage types, I have Shared iso, Shared nfs, ext, and udev. Only the Shared nfs and ext SRs are showing in the selector. 
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 Ping @Bastien-Nollet @CJ are you on XOA or XO sources? Which release or commit? 
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 @olivierlambert I'm running from sources. This happens even on the latest commit. Xen Orchestra, commit 74e6f 
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 There is indeed a bug in the perf-alert plugin with removable storages. This will be fixed in an upcoming XO version by removing these SRs from the perf-alert monitoring. 
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 Hi @CJ I made a small fix for this, would you mind testing this PR and tell us if this fixes your problem? 
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 @CJ the fix has been merged and will be available in the next release. 

