Firefox OS/Performance/Investigating Alerts

When you get an email from fxos-perf-alerts@mozilla.com, there is a good chance it is an automated email.

We have two types of automated alerts:

• Ingestion Alerts (we were expecting data and never received it)
• Regression Alerts (the values of the reported data have changed)

Regression Alerts

A regression alert has a Title in this format

'[ALERT][B2G] <testname> regressed by <-x.x> in <suite>'

example

'[ALERT][B2G] email_memory regressed by -3.6 in vsize, vsize'

The first part of the Alert is the score:

The score can map directly to the confidence of the alert sustaining over time. The range is from 2-4 where 4 is .9999% sure. In the above example, we have a score of 3.32 which is .99932% confident this is a sustained regression.

The next section gives you direct links to the code that built B2G used for this test.

The gaia revision is a link to github that shows the specific changes to gaia.

The gecko revision is a link to github showing the current revision of gecko that we are using.

The last section of the alert is the details of the regression. For the given build, there could be many regressions found, we will list all of them in this section.

We outline which device model is used. The example here is Hamachi, but we support Tarako as well.

The links to previous are links to gaia/gecko revisions for the previous build that ran tests.