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# Built-in Pings
FOG embeds the Glean SDK so
[its documentation on pings is authoritative](https://mozilla.github.io/glean/book/user/pings/index.html).
The only detail FOG adds is to clarify
[the "baseline" ping's schedule](https://mozilla.github.io/glean/book/user/pings/baseline.html#scheduling).
Specifically, in Firefox Desktop, the application is considered
* "active" when started,
or when a user interacts with Firefox after a 20min period of inactivity,
* "inactive" after the user stops interacting with Firefox after 2min of activity.
For more details about why, see the bug tree around