Seems that custom period should is only metric that should be processed independently (regardless browser triggering is on/off)
In global.ini.php we can disable browser archiving for everything except custom period, what seems to be expected behavior (as custom period needs to be archived somehow)
The only time that the browser will still trigger archiving is when requesting a custom date range that is not pre-processed yet
In current version (1.10 and 1.11 - not sure how it worked earlier) after disabling browser archiving (high traffic page - we're using archive scripts to compute data) i had problems with getting correct results for periods
[2013-03-15 15:29:38] [35d4e34d] [13.66 Mb] * ARCHIVING DISABLED, for Preparing archive: range(From 2013-03-12 to 2013-03-13), plugin VisitsSummary , Visits = <br/>
what shouldn't happen for period range.
In attachment patch that should solved this issue.
Keywords: range, custom period, browser trigger
Attachment: Piwik_ArchiveProcessing range fix
We shall use $this->periodId to check which period we are dealing with (the request var may not be set)
In 03a6e97: Fixes #3833 adding check upstream. Thx for the report & patch, very nice bug to fix!
In 5700b37: Refs #3833 - Piwik_Period's toString method does not return the type of the Period and a "Array to String conversion" notice is triggered. So we use the getLabel accessor.