| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| // |
| // Contains information collected by the RAPPOR (Randomized Aggregatable |
| // Privacy-Preserving Ordinal Responses) system. |
| // |
| // For a full description of the rappor metrics, see |
| // http://www.chromium.org/developers/design-documents/rappor |
| |
| syntax = "proto2"; |
| |
| option optimize_for = LITE_RUNTIME; |
| |
| package rappor; |
| |
| // Next tag: 3 |
| message RapporReports { |
| // Which cohort these reports belong to. The RAPPOR participants are |
| // partioned into cohorts in different ways, to allow better statistics and |
| // increased coverage. In particular, the cohort will serve to choose the |
| // hash functions used for Bloom-filter-based reports. The cohort is |
| // generated randomly by the client and is currently in the range [0,512). |
| // Was in range [0,32) in chrome versions before M37. |
| optional int32 cohort = 1; |
| |
| // Each Report contains the values generated by the RAPPOR process for one |
| // metric. |
| message Report { |
| // The name of the metric, hashed (first 8 bytes of MD5 hash). |
| optional fixed64 name_hash = 1; |
| |
| // The sequence of bits produced by random coin flips in |
| // RapporMetric::GetReport(). For a complete description of RAPPOR |
| // metrics, refer to the design document at: |
| // http://www.chromium.org/developers/design-documents/rappor |
| optional bytes bits = 2; |
| } |
| repeated Report report = 2; |
| } |