tree 7288bd48c1ddc8cb296ca5b1e463f57ddce1cf79
parent 4b3ad84d931ab841ba99c23fb81cf8bf939f77f3
author Laura Peskin <pesk@google.com> 1617232119 +0000
committer CQ Bot <commit-bot@chromium.org> 1617232119 +0000

[Cobalt 1.1 privacy] Calculate privacy params for StringCounts reports

Adds support for StringCounts reports to the registry parser's
privacy noise parameter calculator.

The sparsity of a StringCounts report is the smaller of:
- the total number of cells in a CountMin sketch for the report
  (currently hard-coded to 50: 5 hashes with 10 cells per hash)
- the parent metric's string_buffer_max (if set) times the
  number of hashes in a CountMin sketch for the report.

Change-Id: I61e1b5db0a298841cc9f4ed35a105146b572e890
Reviewed-on: https://fuchsia-review.googlesource.com/c/cobalt/+/507063
Fuchsia-Auto-Submit: Laura Peskin <pesk@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
Reviewed-by: Alexandre Zani <azani@google.com>