There are two Kessel metrics that should be exposed based on the sheet
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Expose resources per workspace

histogram of resources per workspace
dimensions: resource_type

Histogram exposed by Inventory. Groups resources in workspaces into 10 buckets
1, 2, 5, 10, 20, 50, 100, 200, 500, 1000

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Number of fabric inventory resources
Gauge exposed by Inventory. Dimensions: resource_type, reporter_name, reporter_id