The LHCb trigger in 2011 and 2012

Thee LHCb trigger has performed very well during the LHC Run I [$_1$], showing a remarkable capacity to adapt to the changing running conditions. One of the key points of this adaptability is the capacity for performing very fast changes in the selection requirements in the software algorithms run in the HLT. While most of the trigger selections were quite stable during Run I, small changes were unavoidable due to changes in the running conditions, e.g., between 2011 and 2012, and the need of adjusting the trigger rates. This fact, combined with the large number of lines included in the HLT, caused frequent changes of trigger configuration during the data taking period. The aim of this document is to provide a detailed record of the various LHCb trigger configurations used for $pp$ collisions during Run I, including the luminosity collected with each of them.