metrics_daemon: report cumulative daily use.

This had been lost in the previous changes.  Also, the meaning
of DailyUse changes: it is now cumulative daily use.  But we should
revise these stats so I think it's OK for now.

TEST=unit tests

Change-Id: I4894fef0ffb237633abcf949c01dd7ea5f5e5d6e
Reviewed-by: Daniel Erat <>
Tested-by: Luigi Semenzato <>
Commit-Queue: Luigi Semenzato <>
3 files changed
tree: 2e8cbaf7acece0cf413ebe152d57cb03f3d289c0
  1. metrics/