The Platform API (PAPI) reference guide contains all accessible URI. The most recent guide can be downloaded using this URL:
From your list:
- JOBs running: See page 141 in the referenced pdf: GET /platform/1/job/jobs (This should return running and paused jobs)
- Cluster status: Not possible to get this info via the API.
- Cluster events/alerts: Not possible to get this info via the API.
- SmartPools status: See SmartPools resource on page 277. The closest one I could find to a 'SmartPools status' is:
Get the status of the OneFS pool system with GET /platform/1/storagepool/status