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Telemetry
Fenix uses Mozilla's telemetry service (Glean) and LeanPlum to measure feature performance and engagement.
Baseline ping
Fenix creates and tries to send a "baseline" ping when the app goes to the background. This baseline ping is defined by the Glean component and documented in the Android Components repository.
Metrics ping
Fenix creates and tries to send a "baseline" ping. It is defined inside the metrics.yaml file. This ping includes things like wether or not Fenix is currently the default browser.
Events
Fenix sends event pings that allows us to measure feature performance. These are defined inside the metrics.yaml file.
Activation
Fenix sends an activation ping once, at startup. Further documentation can be found in the activation ping docs.
Leanplum
See here for details on Leanplum usage in Firefox Preview.