A Time Series Analysis of TravisTorrent Builds: To Everything There Is a Season

We apply a seasonal decomposition time series analysisto TravisTorrent data in order to examine growth trendsand periodic behavior related to number of builds ina continuous integration environment. We apply our techniquesat the macro level using the full TravisTorrent repository consisting of 1,283 projects, and at the micro level considering the Apache Drill project. Our results demonstrate strong seasonal behavior at both the large and small scale using an additive time series model. In addition to being able to accurately capture trend and periodicity in builddata, our techniques are also able to accurately forecast the expected number of builds for a future time interval.