Exclude OS aggregates from capacity used graph

[matejzero]

Describe the bug

On the cluster dashboard, capacity usage is calculates as avg(netapp_aggr_space_used_percent{datacenter=~"$Datacenter",cluster="$Cluster"}). This gives wrong result in my case where I have dedicated aggregates for NetApp OS (not sure if this is typical or not). I guess netapp makes them as small as possible and they are always 93%+ full, skewing the calculation.

Capacity usage on the single panel graph is showing 78% instead of 62%, which is a lot of space in my case:)

Environment
Provide accurate information about the environment to help us reproduce the issue.

• Harvest version: harvest version 21.05.3-2 (commit b482aff) (build date 2021-06-28T21:08:05+0530) linux/amd64
• ONTAP Version: 9.7

To Reproduce

Load latest Cluster dashboard.

Expected behavior

Take only "data" aggregates into the account, to get more precise usage.

Possible solution, workaround, fix

Solution in my case is simple. Add an exclude filter to the metric: avg(netapp_aggr_space_used_percent{datacenter=~"$Datacenter",cluster="$Cluster",aggr!~"aggr0_.+"})

But I'm not sure, if this is a default name for the aggregates (aggr0_-).

[ruanruijuan]

Relate to #99.

[cgrinds]

• Compare with UM capacity aggregate calculation
• Consider creating a plugin that ignores root-aggregate for ZAPIs (REST does this automatically)