Improve metrics docs value_type
The following discussion from !53992 (merged) should be addressed:
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@tkuah started a discussion: (+1 comment) What is "number" ? Is it https://json-schema.org/understanding-json-schema/reference/numeric.html#7f94c79e96a0_Ruby ?
Sorry, if I missed documentation about this
Improve docs to explain number value
https://json-schema.org/understanding-json-schema/reference/numeric.html#number