Add release note

Author: technowhizz

releasenotes/notes/osd-usage-in-dashboards-597ed10af4fc1aa1.yaml

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+---
+features:
+  - |
+    Per OSD usage metrics are now available in the OSDs dashboard. The
+    dashboard now includes a new section that displays a histogram of of the
+    utilization of each OSD in the cluster. This can be useful for identifying
+    OSDs that are outliers in terms of utilization, and may need to be
+    rebalanced. Additionally, there is a histogram displaying the usage of the
+    bluestoreDB for each OSD.