Add Installer.OSAgeDays metric
This adds a new metric conveying the age of the running OS instance,
where this is defined as the time-span between the current wall-clock
time and the time-stamp of the /etc/lsb-release file. This metric is
reported daily.
BUG=chromium:304950
TEST=New unit tests for daily metrics + unit tests pass. Manual test
for Installer.OSAgeDays by inspecting chrome://histograms.
Change-Id: I6713bed6730641a95443372a3e3166c4e1dc64ee
Reviewed-on: https://chromium-review.googlesource.com/172162
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: David Zeuthen <zeuthen@chromium.org>
Tested-by: David Zeuthen <zeuthen@chromium.org>
diff --git a/constants.cc b/constants.cc
index 767dc47..7f9fdf4 100644
--- a/constants.cc
+++ b/constants.cc
@@ -30,6 +30,8 @@
const char kPrefsCurrentResponseSignature[] = "current-response-signature";
const char kPrefsCurrentUrlFailureCount[] = "current-url-failure-count";
const char kPrefsCurrentUrlIndex[] = "current-url-index";
+const char kPrefsDailyMetricsLastReportedAt[] =
+ "daily-metrics-last-reported-at";
const char kPrefsDeltaUpdateFailures[] = "delta-update-failures";
const char kPrefsFullPayloadAttemptNumber[] = "full-payload-attempt-number";
const char kPrefsLastActivePingDay[] = "last-active-ping-day";