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# Telemetry
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Fenix uses Mozilla's telemetry service (Glean) and LeanPlum to measure feature performance and engagement.
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## Glean pings and metrics
By using the Glean SDK, Fenix can send the pings the SDK owns and defines, as documented [in the Glean SDK docs ](https://mozilla.github.io/glean/book/user/pings/index.html ).
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Additional metrics or pings defined by Fenix are documented in the [Glean SDK autogenerated docs ](metrics.md ).
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## Leanplum
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See [here ](https://github.com/mozilla-mobile/fenix/blob/master/docs/mma.md ) for details on Leanplum usage in Firefox Preview.
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## Crash reporting
See [here ](https://github.com/mozilla-mobile/fenix/blob/master/docs/crash-reporting.md ) for details on crash reporting in Firefox Preview.