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List Tag Keys

List all tag keys set on any sandbox in the org, with per-key counts of tagged sandboxes and distinct values. Useful for building group-by pickers without querying the full tag set.
Preview: Usage and tag APIs are new. Endpoints, response fields, and SDK method names may change before GA; temporary inaccuracies or rough edges are possible while the surface settles.
Tag keys on torn-down sandboxes are retained so historical drilldowns keep resolving. As a result sandboxCount may include sandboxes that are no longer active.
Response example
{
  "keys": [
    { "key": "team", "sandboxCount": 17, "valueCount": 4 },
    { "key": "env",  "sandboxCount": 23, "valueCount": 3 }
  ]
}