Basic jq usage. How to get nested value

Tho dot in `storage_server.disk_total" needs to be escaped to prevent it from being interpreted as an object key separator. so you can use:

jq '.stats."storage_server.disk_total"'

assuming that XXXXXXXXXX is a valid JSON number in your real JSON.

To get deeply nested values by their key:

$ jq '.. |."storage_server.disk_total"? | select(. != null)'

.. is a shortcut for the zero-argument recurse -- an analog of the XPath // operator.

For learning how to construct jq queries, it is more useful to look at the tutorial and manual than the "man" page. There's also a FAQ.
The inner key name has a period in it, and therefore the .keyname shorthand cannot be used for it. So you could write:

   .stats["storage_server.disk_total"]

or if your jq allows it:

   .stats."storage_server.disk_total"

These are both abbreviations for:

   .stats | .["storage_server.disk_total"]

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