### Sink energy profiles: what a Linux, Android and iOS sink can read

- **energy-measurement §9.3**: `linux-rapl`'s `needs-privilege` status is the kernel's default.
  Since the response to CVE-2020-8694 the powercap interface creates `energy_uj` readable by
  root alone, and perf's `power` events are system-wide events an unprivileged process opens
  only with `perf_event_paranoid` at 0 or less, or with `CAP_PERFMON`.
- **§9.4**: why a phone states an `Estimator` in this revision. Android's power monitors
  (API level 35) are read again only after 30 s and returned lowered by up to 10 J of
  deliberate noise, with rails named by each device, which gives no reading over a segment's
  decode; iOS declares a per-task energy count that no reference sink has read. No profile
  reads either.
- **§6.3**: a bracket over counters that do not cover a fabric that ran a step has coverage
  `Partial` (§9.1), a lower bound.