Start a measurement of one keyword's popularity and/or difficulty in one storefront when the stored value…

Start a measurement of one keyword's popularity and/or difficulty in one storefront when the stored value is missing or stale. A fresh value or verified absence is returned without new work; a request that joins a job already running uses no daily measurement unit; the request that starts new work uses one from the workspace's daily Hive measurement allowance. The two metrics are independent: a failed source leaves the other valid metric in the answer. wait (0–20 seconds) keeps the call open until the result is stored; 202 means it is still running — read it later with hive_keyword_metrics. Needs the opt-in hive:measure scope: chosen on the API key, or approved separately when connecting over OAuth. iOS only.